There were a couple of exceptions, but the effective end of Palestinian Arab war leaders occurred on April 8, 1948 (reported in the April 9 Palestine Post:)
It turns out that Salameh (who had parachuted into Palestine in 1944 along with Nazi paratroopers) did return to Lydda later in April, and was killed in June. (And, as noted there, his son was one of the architects of the Munich Olympic massacre, assassinated by the Mossad in 1979.)