Re: Charley Chase, and his brother Paul: Clinically, it's really hard to drink yourself to death at their ages. It's possible, but the level of achievement these men reached could not have been reached by hopeless alcoholics. One might be inclined to blame their early deaths on bootleg prohibition whiskey, but they were wealthy Hollywood players - like Buster Keaton, they had the finest liquors available for a phone call. The great jazz cornetist Bix Beiderbecke died of booze in 1931, age 28, but he'd been drinking bootleg swill for a decade. Janis Joplin and Jim Morrison, thirty years later, died of legit booze, but they were junkies as well, and their acts consisted at least in part of their incapacity. Paul Parrott hid his addictions ( booze and drugs, one presumes hard drugs ) from the movie public at least for a while by moving behind the camera. My point being it's fairly amazing that Charley Chase was so productive, especially in front of the camera, for so long if his addiction was so severe. I can think of three possible explanations: one, that he, like his brother Paul, had a drug problem as well, and finally OD'ed, though this is an unsubstantiated guess; and two, equally unsubstantiated, that he was a binge drinker, able to stay sober and productive for a while, and then would be helpless against liquor until it came close to killing him, or indeed finally did. Third is that they were both genetically predisposed to early heart attacks and would have died in their forties no matter what their lifestyles were. I admit I know of no evidence for or against any of the three theories.