Two Florida law enforcement officers were killed Monday during a manhunt for a murder suspect who has been on the run since he was accused of fatally shooting a pregnant mother last month.

Orlando police Master Sgt. Debra Clayton, 42, was shot by the suspect, Markeith Damengzlo Loyd, 41, after she responded to a sighting of him outside a Walmart store about 7:15 a.m. ET Monday, Police Chief John Mina told reporters. Clayton returned fire, but authorities don't believe Loyd was struck.