at clements' memorial service, his wife lisa described the moment he was killed. >> last tuesday night. tom and i were watching tv and our doorbell rang. and my life was forever changed. >> the prime suspect in clements' murder is evan ebel, recently paroled convict killed in a shootout with police in texas two days later. a small vial filled with a virus that may be used in a bioterror attack vanished from the lab at university of texas. officials believe the potentially deadly virus was accidentally discarded during cleaning and poses no risk. but there is growing concern about the management of similar labs across the country. the government investigators are calling for more oversight. 22-year-old daredevil was killed while trying a stunt that's popular on youtube. the man was trying to swing through the opening of a sandstone arch in utah, the arch 100 feet tall.