NEW BEDFORD — Bernadette DePina, the mother of reputed gang member and accused killer David "Crunchy" DePina II, was found shot to death in her bedroom yesterday, raising fears of gang retaliation, sources said. Mr. DePina, 23, is charged with a shooting that killed a reputed gang rival Sunday. Mayor Scott W. Lang wouldn't specifically say he believed Ms. DePina's murder was gang-related, but community activists who gathered near Ms. DePina's home yesterday said they were worried it was retaliation. During a press conference, the mayor asked New Bedford to "take a step back" and later visited troubled spots in...