As a general rule of thumb, dead means dead.
However, while all the characters from Orphans of Mars would be long since dead as of 2010 A.D., only those Martians shown to be dead within the series timeline are classified as deceased.
“Anders Ray Cradle II (1943-December 25, 2005), known more commonly as Ray Cradle, was a...Ray Cradle
“Reanna Cradle (1944-2004), born Reanna Jordan and commonly referred to as Ree, was the wife of...Ree Cradle
“Moses Mason (birthdate unknown; died 2007) was the father of Derek Mason. A former professional...Moses Mason
“Harry Cash, better known as the Gas-Man, was a super-criminal who utilized a flying metal suit...Harry Cash
“Red Fido was a super-powered canine, employed by the Soviets as a demonstration of their...Red Fido
“Talbot Porter (died 1960) was a sixty-foot-tall pulp novelist and World War II-era four-colour...Rhodes
“Pharos was a founding member of the Seven Wonders who was based out of Jolt City; Roy Riddle...Pharos