Dallas police shooting: Memorial grows for officer killed in the line of duty FOX 4 News Dallas-Fort WorthDallas Police Officer ‘Executed’ in Premeditated Attack, Officials Say The New York TimesDallas police shooting suspect: Here’s what we know about Corey Cobb-Bey FOX 4 News Dallas-Fort WorthOfficers Injured, One Officer Killed In the 900 block E. Ledbetter Drive DPD BeatDallas officer ‘executed,’ two others injured in targeted attack, police say The Washington Post