Both Philip Marlowe, Private Eye, and an American Western television Series produced by David Milch feature which actor? 
Philip Marlowe, Private Eye:  It was an early example of the uncompromising commitment to authenticity HBO would become known for in period pieces, recently showcased in "Rome" and "Deadwood", the latter of which also featured actor Powers Boothe. Deadwood (TV series): Deadwood is an American western television series created, produced, and largely written by David Milch, that aired on the premium cable network HBO from March 21, 2004, to August 27, 2006, spanning 36 episodes and three seasons.
Powers Boothe