Jonas Hallberg, a renowned Swedish television and radio personality, passed away due to a sudden heart disease at age 80 after a period of illness.Hallberg was known for hosting the classic rock and talk show "Måndagsbörsen" on SVT in the late 1970s and 1980s, featuring playful interviews with celebrities including Olof Palme and Motörhead.He also participated for a long time in the Sveriges Radio P1 program "Spanarna" and was described by Helena von Zweigbergk as an "incredibly warm, funny, and loyal friend."