Mancilla , Monday , shot to death as he sat in his car with One others . two of the other men was the target , police say . Threats exchanged over the Internet , and murder plot was hatched , police say . One men in custody ; police executing search warrants .
Henry Mancilla , 24 , shot to death as he sat in his car with two others . One of the other men was the target , police say . Threats exchanged over the Internet , and murder plot was hatched , police say . Four men in custody ; police executing search warrants .