On this day: May 20

Published On: May 17 2013 04:26:12 PM CDT   Updated On: May 20 2016 01:00:00 AM CDT

Vasco da Gama arrives in India, Christopher Columbus dies, Norman Rockwell makes his Saturday Evening Post cover debut, HIV is discovered, and "Cheers" airs its series finale, all on this day.

OTD May 20 - Abdelbaset al-Megrahi
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2012: Abdelbaset al-Megrahi, the Libyan terrorist responsible for the 1988 Pan Am Flight 103 bombing over Lockerbie, Scotland, dies of prostate cancer at age 60 in Tripoli, Libya. Megrahi was convicted in 2001 of 270 counts of murder for the bombing and was sentenced to life imprisonment. However, the Scottish government freed Megrahi on Aug. 20, 2009, (seen here in white) after he was given around three months to live following a diagnosis of terminal prostate cancer.

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