LOS ANGELES—New York real estate heir Robert Durst, who days ago was sentenced in a two-decade-old murder case, has been hospitalized after contracting COVID-19, his lawyer said Saturday, Defense Attorney Dick DeGuerin said he was notified that Durst was admitted after testing positive for the coronavirus. DeGuerin said he didn’t know Durst’s condition and was trying to find out more details. Durst, 78, was sentenced Thursday to life in prison without a chance of parole for the murder of his best friend more than two decades ago. Durst, who has numerous medical issues, sat in a wheelchair with a catatonic stare during much of the sentencing hearing. “He was very, very sick in the courtroom,” DeGuerin said Saturday. He was convicted in Los Angeles Superior Court last month of first-degree murder for shooting Susan Berman point-blank in the back of the head at her home in December 2000. The killing …