For anyone interested on these matters there is a very good article on Vanity Fair magazine by Ron Rosenbaum
Has Hitler’s Half Niece and Lover commited suicide or has she been murdered due to her antics and indiscretions?
The unresolved and hastily covered-up death in 1931 of Geli Raubal, Hitler’s half-niece and romantic obsession, has long been relegated to the murky footnotes of the Führer’s early career in the demimonde of Munich. As calls for a new investigation stir up another Austrian crisis of conscience, Ron Rosenbaum reports on a sixty-year-old mystery.
Well read it on here – Hitler’s Doomed Angel – Geli Raubal