Give you more details on revealed here. Break down the forensic evidence used to catch Howard. Summarize the next episode in the season. Let me know how you'd like to explore this episode further! Collision | CSI | Fandom

The team identifies the killer as Howard Benchley , Barbara's abusive ex-husband. After her car was run off the road by another man (Russel Miller), Howard found her and beat her to death with a gun.

To solve the case, Horatio Caine must ask Natalia Boa Vista to reveal a secret about her past. It is uncovered that Barbara was part of a support group for abused women—the same group Natalia belongs to.