After a standoff of more than 21 hours, officers entered an apartment where a felon with a gun had barricaded himself with four children and found them all dead, a police chief said. Orlando Police Chief John Mina said at a news conference just before midnight Monday that Gary Wayne Lindsey, 35, was found dead in a closet when officers entered the apartment around 9 p.m. The children with Lindsey ranged in age from 1 to 11. Two of them were Lindsey’s and two were his girlfriend’s, officers said. A police spokeswoman said Tuesday that the medical examiner, as part of an investigation, would determine when the children were killed. Court records show Lindsey had an extensive criminal history involving arson, battery and theft. He was on probation for several charges including arson.