Walker suffered a cerebral thrombosis on 7 July 1944 and died two days later at the Naval Hospital at Seaforth, Merseyside aged 48; his death was attributed to overwork and exhaustion.
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Two of the submarines, U-462, a Type XIV, and U-504, a Type IX/C40, were then sunk by Walker's group, and the second Type XIV, U-461, by Australian Short Sunderland flying boat.
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Wren, a Modified Black Swan class sloop launched on 11 August 1942 and, as part of Captain Frederic Walker's Second Escort Group, assisted in the sinking of several U-boats.