click or call. >>> more than two years after karyn slover's murder, investigators now suspected that her ex-in-laws were involved. the motive? karyn's former mother-in-law, jeannette, wanted sole custody of her 3-year-old grandson. >> i think jeannette slover is filled with rage. i think that the relationship between jeannette and karyn was not good. i think that jeannette felt like the boy was her own, that karyn was a threat to take the boy from her, and she had to eliminate the threat. >> investigators found no forensic evidence inside the slovers' house, but concrete from their used car lot was consistent with concrete found in the garbage bags with karyn's body. investigators wanted more proof and went to unusual lengths to get it. they called in the army to help them remove all the topsoil from the slovers' 5,000-square-foot car lot. during a late winter snowstorm, 60 five-gallon buckets were filled with material. for six painstaking months, teams of investigators sifted through the debris. finally, they found a potential clue, a button that read "authentic paris sports club." t