Long ago,& still not solved. Horrible! Call Yonkers police, HEAD detective asking about a "cold Case file." Track daughter Mindy CHAMBERS; figure age newspaper. Run her name through Ancestry for Old Directories.

CHAMBERS family big in Yorktown. Big old house with barn
at 2255 Broad St, Yorktown Heights, NY 10598. Listed in 2011 Westchester County phone bookas: CHAMBERS, Richard and Mary Jo, phone 914-245-7026.

Same source, 2 listings:
CHAMBERS,M--230 S.7th Ave.,Mt Vernon,NY/914-668-3619;
CHAMBERS,M E--120 Winthrop Av.,Elmsford,NY/914-592-5049