— A contracted security worker fatally shot a colleague at the Northrop Grumman facility in Linthicum Wednesday afternoon, Anne Arundel County Police said. WATCH: Security worker allegedly kills colleague in shooting at Northrop Grumman Security worker allegedly kills colleague in shooting at Northrop GrummanPolice responded to the shooting at 3:35 p.m. following reports of the deadly incident. According to Anne Arundel County Police spokesperson Justin Mulcahy, two contracted security workers—both adult males—became involved in an argument. A third security worker intervened and detained the suspect until police arrived. Charges are pending against the security worker who allegedly killed his colleague.