as they had done with c-styles, michelle and monica now tried to find derek. i didn t know derek s name. i thought his name was myers. and i was spelling derek the wrong way. and looking for him, like, i mean, just forever. reporter: if they had managed to tail derek they would have found a guy who didn t seem to fit the profile of a killer. he was doing well, says his sister danielle. he had gotten his bachelor s degree in business, he had went on to start his own company. he was doing great. he was always happy, he was always in good spirits, he was driven. reporter: he still had that silver mustang convertible with the custom plates my whip. although monica and michelle never spotted the car, tia did. i stopped at a light, and derek pulled up next to me in a car with the top down, listening to music. i just felt like this was so unfair that it s a nice, sunny day, and he s going on with life. it just, like, tripped me out. like, this guy really just did