ROUND ROCK, Texas — A suspect who had been charged in a fatal May 6 hit-and-run crash in Austin died two months later in a separate crash on Interstate 35 in Round Rock, Travis County prosecutors have confirmed. Agustin Guillen, 38, was one of three people killed in the crash in the early morning hours of June 29. Round Rock police said three vehicles were involved, and their investigation led to the arrest of 22-year-old Kearra Thomas on suspicion of driving while intoxicated.