husband, larry risken.on. >> bourdeau's behavior and story seemed suspicious. so, just days later, they brought him back again. this time for a polygraph test. >> were you involved in the shooting of sonia? >> no i would never hurt my mom. >> what was the biggest resentment you had against her? >> and though bourdeau said sometimes they didn't communicate, things had gotten better. but they kept pushing. >> [inaudible] were you involved? >> i will not change my answer. i did not kill my mom. i'm not involved in my mom's death. >> who is it that you think is responsible? >> number one person who is responsible is her husband's sister. sherry jackson. >> wait a minute! sherry jackson, really? >> but then, nobody seemed to hate sonia more than sherry hated sonia. nobody, except maybe, dennis bourdeau. >> coming up -- >> yeah, if i had the opportunity to kill her, in a heartbeat. >> who else might want sonia dead? the lists were long. >> they certainly had a motive, didn't she? >> yes, her and about 100 other p