Charges come weeks after New York real estate heir was sentenced to life in prison for killing a friend who provided alibi in wife's death

NY real estate heir shot Berman at point-blank range in 2000 as she was set to tell cops she helped cover up his wife’s killing

Prosecutors say Susan Berman was murdered by real estate heir because she was about to reveal to investigators his involvement in the 1982 presumed death of his wife, Kathie