Summary:
A man suspected of shooting dead three people in the US state of Maryland has been identified, police say.

Full article:
(CNN) -- Homicide detectives outside Baltimore are investigating an apparent murder-suicide involving a police officer and a firefighter. Three people were found dead inside a home in Glen Burnie, Maryland, early Sunday morning after a reported shooting around 1:35 a.m., police in Anne Arundel County said. Police said the suspected shooter -- Christopher Lee Robinson, 37, a Baltimore police officer -- was one of the people found dead at the scene. Baltimore firefighter Andrew Scott Hoffman, 27, and Marie Leanne Edith Hartman, 26, were killed. "Preliminary investigation indicates that the suspect/shooter was one of the deceased and that he had a relationship with the female victim," police said. Police said they were still investigating the shooter's motive, but described the shooting as a "domestic incident." "It's a tragic situation. ... We believe this incident is all connected to some known relationships," Anne Arundel County police spokesman Lt. T.J. Smith told CNN affiliate WBFF. Hoffman was a third-generation member of the fire department who had worked for the city since 2006, Baltimore Fire Chief Jeffrey Segal said in a statement, according to WBFF. Earlier this year, WBFF said, he earned praise from local officials for helping a lost toddler find his way home. Mom, 4 kids dead in Brooklyn stabbing . 5 people, 2 dogs dead at Phoenix condo complex . CNN's Rick Martin contributed to this report.