diff --git a/java/src/org/broadinstitute/sting/gatk/walkers/SplitSamFileWalker.java b/java/src/org/broadinstitute/sting/gatk/walkers/SplitSamFileWalker.java
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+++ b/java/src/org/broadinstitute/sting/gatk/walkers/SplitSamFileWalker.java
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+/*
+ * Copyright (c) 2009 The Broad Institute
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package org.broadinstitute.sting.gatk.walkers;
+
+import net.sf.samtools.*;
+import org.broadinstitute.sting.gatk.walkers.WalkerName;
+import org.broadinstitute.sting.gatk.walkers.ReadWalker;
+import org.broadinstitute.sting.gatk.walkers.Requires;
+import org.broadinstitute.sting.gatk.walkers.DataSource;
+import org.broadinstitute.sting.gatk.walkers.recalibration.*;
+import org.broadinstitute.sting.utils.cmdLine.Argument;
+import org.broadinstitute.sting.utils.*;
+import org.apache.log4j.Logger;
+
+import java.util.*;
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
+import java.io.File;
+import java.io.FileNotFoundException;
+
+@WalkerName("SplitSamFile")
+@Requires({DataSource.READS})
+public class SplitSamFileWalker extends ReadWalker<SAMRecord, Map<String, SAMFileWriter>> {
+    @Argument(fullName="outputRoot", doc="output BAM file", required=false)
+    public String outputRoot = null;
+
+    private static Logger logger = Logger.getLogger(SplitSamFileWalker.class);
+    private static String VERSION = "0.0.1";
+
+    public void initialize() {
+        logger.info("SplitSamFile version: " + VERSION);
+    }
+
+    public SAMRecord map(char[] ref, SAMRecord read) {
+        return read;
+    }
+
+    // --------------------------------------------------------------------------------------------------------------
+    //
+    // Standard I/O routines
+    //
+    // --------------------------------------------------------------------------------------------------------------
+    public void onTraversalDone(Map<String, SAMFileWriter> outputs) {
+        for ( SAMFileWriter output : outputs.values() ) {
+            output.close();
+        }
+    }
+
+    public Map<String, SAMFileWriter> reduceInit() {
+        HashMap<String, SAMFileHeader> headers = new HashMap<String, SAMFileHeader>();
+        for ( SAMReadGroupRecord readGroup : this.getToolkit().getEngine().getSAMHeader().getReadGroups()) {
+            final String sample = readGroup.getSample();
+            if ( ! headers.containsKey(sample) ) {
+                SAMFileHeader header = Utils.copySAMFileHeader(this.getToolkit().getEngine().getSAMHeader());
+                logger.debug(String.format("Creating BAM header for sample %s", sample));
+                ArrayList<SAMReadGroupRecord> readGroups = new ArrayList<SAMReadGroupRecord>();
+                header.setReadGroups(readGroups);
+                headers.put(sample, header);
+            }
+
+            SAMFileHeader header = headers.get(sample);
+            List<SAMReadGroupRecord> newReadGroups = new ArrayList<SAMReadGroupRecord>(header.getReadGroups());
+            newReadGroups.add(readGroup);
+            header.setReadGroups(newReadGroups);
+        }
+
+        HashMap<String, SAMFileWriter> outputs = new HashMap<String, SAMFileWriter>();
+        for ( Map.Entry<String, SAMFileHeader> elt : headers.entrySet() ) {
+            final String sample = elt.getKey();
+            final String filename = outputRoot + sample + ".bam";
+            logger.info(String.format("Creating BAM output file %s for sample %s", filename, sample));
+            SAMFileWriter output = Utils.createSAMFileWriterWithCompression(elt.getValue(), true, filename, getToolkit().getBAMCompression());
+            outputs.put(sample, output);
+        }
+
+        return outputs;
+    }
+
+    /**
+     * Write out the read
+     */
+    public Map<String, SAMFileWriter> reduce(SAMRecord read, Map<String, SAMFileWriter> outputs) {
+        final String readGroup = read.getAttribute("RG").toString();
+        final String sample = read.getHeader().getReadGroup(readGroup).getSample();
+        SAMFileWriter output = outputs.get(sample);
+
+        if ( output != null ) {
+            output.addAlignment(read);
+        } else {
+            throw new RuntimeException(String.format("Read group %s not present in header but found in read %s", readGroup, read.getReadName()));
+        }
+
+        return outputs;
+    }
+}
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