adventure awaits. >>> shaun gayle was a handsome and popular ex-football player for the chicago bearsrlfriend, rhoni reuter was dead. rhoni wasn't the only woman in shaun's life. they learned that from shaun himself. >> it was an open relationship. >> reporter: it was not exclusive? >> correct. >> reporter: one of the women he dated the year before might be responsible for rhoni's death. monika kurowska. she was 27 at the time. he was 43. >> he was a person who i can truly open up in a gentleman manner. she said shaun never mentioned other women. she assumed she was the only one he was dating. late one evening, monika happened to be in shaun's neighborhood and stopped by his home. >> i stopped by the window, where i saw him sitting with another woman. i have never suspected there was somebody else. that was not for me. there was shock. >> reporter: she started knocking on his window. >> i got upset because they ran upstairs. if it was a friend, why not open the door? >> reporter: she admits breaking the window. she didn't intend to. >> i was angry. i don't think i was ever cheated by