and so that was the first murder i'd ever covered in vincennes.rising to me that it had happened. andrea canning (voiceover): almost immediately, leads started to pour in. and chief deputy prosecuting attorney hal johnston joined the detectives to help sort through them all. the difficulty is you can't glean at that point what's valid and what's invalid. you have to just start taking interviews from people. andrea canning (voiceover): to organize the information that was coming in, investigators began constructing a timeline of brook's last day. but even as they put it together, they realized their task wouldn't be quick or easy. i mean, just a lot of interviews and a lot of people to talk to. andrea canning (voiceover): detectives learned that saturday, september 6, brook's social calendar was jam-packed with multiple hangouts and off-campus parties. at 3:00 pm, she'd met with someone she'd just befriended that semester. his name was steve hoffman. the two hung out for a few hours, then walked to a subway shop to grab a sandwich before going thei