diff --git a/src/services/services.ts b/src/services/services.ts
index ced2ccd83ae..10eedb8e131 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -890,9 +890,6 @@ module ts {
 
         getSignatureHelpItems(fileName: string, position: number): SignatureHelpItems;
 
-        // Obsolete.  Use getSignatureHelpItems instead.
-        getSignatureAtPosition(fileName: string, position: number): SignatureInfo;
-
         getRenameInfo(fileName: string, position: number): RenameInfo;
         findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean): RenameLocation[];
         
@@ -917,41 +914,6 @@ module ts {
         dispose(): void;
     }
 
-    export interface SignatureInfo {
-        actual: ActualSignatureInfo;
-        formal: FormalSignatureItemInfo[]; // Formal signatures
-        activeFormal: number; // Index of the "best match" formal signature
-    }
-
-    export interface FormalSignatureItemInfo {
-        signatureInfo: string;
-        typeParameters: FormalTypeParameterInfo[];
-        parameters: FormalParameterInfo[];   // Array of parameters
-        docComment: string; // Help for the signature
-    }
-
-    export interface FormalTypeParameterInfo {
-        name: string;        // Type parameter name
-        docComment: string;  // Comments that contain help for the parameter
-        minChar: number;     // minChar for parameter info in the formal signature info string
-        limChar: number;     // lim char for parameter info in the formal signature info string
-    }
-
-    export interface FormalParameterInfo {
-        name: string;        // Parameter name
-        isVariable: boolean; // true if parameter is var args
-        docComment: string;  // Comments that contain help for the parameter
-        minChar: number;     // minChar for parameter info in the formal signature info string
-        limChar: number;     // lim char for parameter info in the formal signature info string
-    }
-
-    export interface ActualSignatureInfo {
-        parameterMinChar: number;
-        parameterLimChar: number;
-        currentParameterIsTypeParameter: boolean; // current parameter is a type argument or a normal argument
-        currentParameter: number;        // Index of active parameter in "parameters" or "typeParamters" array
-    }
-
     export interface ClassifiedSpan {
         textSpan: TextSpan;
         classificationType: string; // ClassificationTypeNames
@@ -4782,68 +4744,6 @@ module ts {
             return SignatureHelp.getSignatureHelpItems(sourceFile, position, typeInfoResolver, cancellationToken);
         }
 
-        function getSignatureAtPosition(filename: string, position: number): SignatureInfo {
-            var signatureHelpItems = getSignatureHelpItems(filename, position);
-
-            if (!signatureHelpItems) {
-                return undefined;
-            }
-
-            var currentArgumentState = { argumentIndex: signatureHelpItems.argumentIndex, argumentCount: signatureHelpItems.argumentCount };
-
-            var formalSignatures: FormalSignatureItemInfo[] = [];
-            forEach(signatureHelpItems.items, signature => {
-                var signatureInfoString = displayPartsToString(signature.prefixDisplayParts);
-
-                var parameters: FormalParameterInfo[] = [];
-                if (signature.parameters) {
-                    for (var i = 0, n = signature.parameters.length; i < n; i++) {
-                        var parameter = signature.parameters[i];
-
-                        // add the parameter to the string
-                        if (i) {
-                            signatureInfoString += displayPartsToString(signature.separatorDisplayParts);
-                        }
-
-                        var start = signatureInfoString.length;
-                        signatureInfoString += displayPartsToString(parameter.displayParts);
-                        var end = signatureInfoString.length;
-
-                        // add the parameter to the list
-                        parameters.push({
-                            name: parameter.name,
-                            isVariable: i === n - 1 && signature.isVariadic,
-                            docComment: displayPartsToString(parameter.documentation),
-                            minChar: start,
-                            limChar: end
-                        });
-                    }
-                }
-
-                signatureInfoString += displayPartsToString(signature.suffixDisplayParts);
-
-                formalSignatures.push({
-                    signatureInfo: signatureInfoString,
-                    docComment: displayPartsToString(signature.documentation),
-                    parameters: parameters,
-                    typeParameters: [],
-                });
-            });
-
-            var actualSignature: ActualSignatureInfo = {
-                parameterMinChar: signatureHelpItems.applicableSpan.start(),
-                parameterLimChar: signatureHelpItems.applicableSpan.end(),
-                currentParameterIsTypeParameter: false,
-                currentParameter: currentArgumentState.argumentIndex
-            };
-
-            return {
-                actual: actualSignature,
-                formal: formalSignatures,
-                activeFormal: 0
-            };
-        }
-
         /// Syntactic features
         function getCurrentSourceFile(filename: string): SourceFile {
             filename = normalizeSlashes(filename);
@@ -5470,7 +5370,6 @@ module ts {
             getFormattingEditsForDocument,
             getFormattingEditsAfterKeystroke,
             getEmitOutput,
-            getSignatureAtPosition,
         };
     }
 
diff --git a/src/services/shims.ts b/src/services/shims.ts
index a355ddafab2..f7dd1b6cfd4 100644
--- a/src/services/shims.ts
+++ b/src/services/shims.ts
@@ -98,9 +98,6 @@ module ts {
 
         getSignatureHelpItems(fileName: string, position: number): string;
 
-        // Obsolete.  Use getSignatureHelpItems instead.
-        getSignatureAtPosition(fileName: string, position: number): string;
-
         /**
          * Returns a JSON-encoded value of the type:
          * { canRename: boolean, localizedErrorMessage: string, displayName: string, fullDisplayName: string, kind: string, kindModifiers: string, triggerSpan: { start; length } }
@@ -609,14 +606,6 @@ module ts {
                 });
         }
 
-        public getSignatureAtPosition(fileName: string, position: number): string {
-            return this.forwardJSONCall(
-                "getSignatureAtPosition('" + fileName + "', " + position + ")",
-                () => {
-                    return this.languageService.getSignatureAtPosition(fileName, position);
-                });
-        }
-
         /// GOTO DEFINITION
 
         /**