Marine Charles Andrews died along with the rest of  'T' Company 40RM Commando, when the ship they were on board, HMS Fidelity, was torpedoed and sunk.

Marine Cyril Basham died along with the rest of  'T' Company 40RM Commando, when the ship they were on board, HMS Fidelity, was torpedoed and sunk.

Marine George Bowering died during operations at Salerno, Italy.

Sources
[1] CWGC.
[2] Registers of Reports of Deaths - Naval Ratings / National Archives file ADM 104/128.

Marine Charles Chapman died along with the rest of  'T' Company 40RM Commando, when the ship they were on board, HMS Fidelity, was torpedoed and sunk.

Marine Edward Stewart Daly died by accidental drowning.

Sources
[1] CWGC.
[2] Registers of Reports of Deaths - Naval Ratings / National Archives file ADM 104/129.

Corporal Alfred Duerden died during operations at Dieppe.

Marine Frederick Goodyer-Kettley died along with the rest of  'T' Company 40RM Commando, when the ship they were on board, HMS Fidelity, was torpedoed and sunk.

Marine Reginald Hill died along with the rest of  'T' Company 40RM Commando, when the ship they were on board, HMS Fidelity, was torpedoed and sunk.

Read an article about his life written by his niece here: Mne P.L. HOLMES.

Sources
CWGC.
Registers of Reports of Deaths - Naval Ratings / National Archives file ADM 104/132.

Marine Harry Humphreys died along with the rest of  'T' Company 40RM Commando, when the ship they were on board, HMS Fidelity, was torpedoed and sunk.

Marine Reginald Lagor died along with the rest of  'T' Company 40RM Commando, when the ship they were on board, HMS Fidelity, was torpedoed and sunk.

Able Seaman Keith Mayor was one of the raiding party at Kopervik, Norway (Operation Checkmate). He was captured and later executed at Belsen Concentration Camp having been transferred there from Sachsenhausen.

Marine Joseph McGee died along with the rest of  'T' Company 40RM Commando, when the ship they were on board, HMS Fidelity, was torpedoed and sunk.

Marine William Murphy died during operations at Normandy on D Day.

Marine John Palmer died along with the rest of  'T' Company 40RM Commando, when the ship they were on board, HMS Fidelity, was torpedoed and sunk.

Marine Henry Pember died along with the rest of  'T' Company 40RM Commando, when the ship they were on board, HMS Fidelity, was torpedoed and sunk.

Marine James Richmond died along with the rest of  'T' Company 40RM Commando, when the ship they were on board, HMS Fidelity, was torpedoed and sunk.

Marine Ronald Thomas died during operations at Normandy on D Day.

Corporal Thomas Thorp died during operations at Dieppe.

Marine Anthony Turner died during operations in Sicily whilst aboard the HMS Queen Emma during an enemy air attack on the vessel. 

Colour Sergeant James Twigger died during operations at Salerno.

Corporal John Watson was killed during the operation to take the enemy held coastal resort of Franceville Plage which had been given the local codename of Piccadilly.