49 Sqn (Cave Canem) RAF Fulbeck, Lancaster III aircraft PB 374 EA-N failed to return from a night raid to bomb the oil refinery at Lutzkendorf, Germany.
Flying Officer MR McKay (RCAF), Flying Officer R Cluer (RAFVR), FS JH McGuigan (RAAF), FS RE Wilkins (RAFVR), Sergeant PFC Jackson (RAFVR), Sergeant P Lipp (RAFVR) and Sergeant GA MacLennan (RAF) were missing, believed killed. Most of this crew were on their eighth operation. They have no known graves and are all commemorated on the Runnymede War Memorial.
Flying Officer McKay was BROTHER to Flying Officer Donald Gordon McKay (RCAF), killed 1945-01-16 on 405 Sqn Lancaster PB 402 LQ-M
Detail from aviation-safety.net
McKay, Murray Roy (Flying Officer)
Killed in Action 1945-April-09

Birth Date: 1924-August-18
Born: Portage la Prairie, Manitoba
Parents: Son of James Gordon McKay and Florence May McKay, of Portage la Prairie, Manitoba. Brother of Donald Gordon McKay who was killed in action on January 16, 1945 while serving with the Royal Canadian
Spouse:
Home: Portage La Prairie, Manitoba
Enlistment: Winnipeg, Manitoba
Enlistment Date: 1942-November-02
Service
RCAF
Unit
49 (B) Sqn- Squadron (RAF)
Cave Canem Beware of the dog
Base
Rank
Flying Officer
Position
Bomb Aimer
Service Numbers
J/38401
Prev: R/196429