Prince Frederick, MD – On March 3 at approximately 12:40 p.m., the Calvert Control Center received a 911 call from a citizen reporting a male subject was lying unconscious along Sixes Road in Prince Frederick. Deputies responded to the area and located a black male in the shared driveway of 1707 Sixes Road.  The male subject appeared to have extensive head injuries and was bleeding profusely. EMS personnel responded and transported the subject to Calvert Memorial Hospital.

The subject was identified as Rodney Vincent Mackall of Sixes Road in Prince Frederick.  Mackall was suffering from severe cerebral bleeding and skull fractures. 

He was unconscious and unresponsive.  Mackall’s injuries were consistent with injuries caused by a blunt object.  Mackall was said to be in grave condition upon his arrival at Calvert Memorial Hospital. Mackall was transported to the University of Maryland in Baltimore for further treatment.

Through investigation It was determined that Nicole Dalrymple (pictured above) was driven to 1707 Sixes Road by Melvin Johnson.  Dalrymple’s husband, Gary Mason (pictured below), accompanied her to the Sixes Road address where the assault took place. Allegedly the purpose of the trip was to purchase crack cocaine.


Mason, Dalrymple, and Johnson were located and taken to the Calvert County Sheriff’s Office for questioning.  Mason advised Criminal Investigation Bureau personnel that he went to Mackall’s residence with Dalrymple to purchase crack cocaine.  Mason said when they contacted Mackall he said “Hello Beautiful” to his wife and that made him “Furious”.  Mason said he struck Mackall in the head with a mallet and he fell to the ground.  Mason said he struck Mackall several more times with the mallet and with his fist. Mason said he and Dalrymple left the area and began to walk towards Rt. 4 where they were picked up by Johnson. Mason said Dalrymple went through Mackall’s pockets and took crack cocaine and his wallet.

Dalrymple was also interviewed by detectives and gave similar statements of the events that occurred on March 3, 2015. Nicole Danielle Dalrymple, 27, of Port Republic and Gary Sylvester Mason, 35, of Port Republic, were charged with attempted 1st degree murder, 1st and 2nd degree assault, and armed robbery for their involvement.

Rodney Vincent Mackall, 52, of Prince Frederick succumbed to his injuries during the afternoon hours on March 4. Charges on Mason and Dalrymple will be amended as a result of Mackall’s death.