yes, that was pam zimmerman. ford and brother, larry alexander, pam was also the family's smart, ambitious star. >> she was valedictorian of her class, graduating class. >> she was a straight a student her entire grade school and high school, except i think one "b, " which she got in home-ec. >> i mean i've always known we had the most amazing mom. such a bright happy person. full of wisdom, smart, funny. i could go on and on. >> she always made sure that we came first. she'd come home from work, she'd make us dinner, she'd stay up all night helping us with homework or doing our laundry. >> we called her, like, supermom because she literally did everything. >> and yet for all the love she inspired, pam zimmerman must have stirred something dark in someone or got in someone's way. wasn't long before the police figured out that her death was no accident. what did the police tell you? >> nothing. they kept the evidence very, very, very quiet. >> when did you find out how she was killed? >> a few days later, police ca