Baltimore County police are searching for a suspect wanted in connection with the armed robbery of an Arbutus grocery store in June, according to police. A warrant has been issued for John David Lamont Caldwell II, 41, of the 1900 block of Wilkins Ave. in Baltimore. Caldwell is wanted on two counts of armed robbery and felony use of a handgun in the robbery of the Mars supermarket in the 1000 block of Maiden Choice Lane at 6:52 p.m. June 21, police said. Police say Caldwell and another man entered the store, and one went behind the counter and demanded cash from an employee. While leaving the store, one man turned and shot at a store security guard, who returned fire, wounding Jamison Harvey Johnson, 40. After recovering at Maryland Shock Trauma Center, Johnson was charged with attempted first-degree murder, armed robbery and felony use of a handgun.