What happened May 1991 AD

In Tovarnik, a Croat policeman was killed by Serb paramilitaries on 2 May.

While in Sotin, a Serb civilian was killed on 5 May when he was caught in a crossfire between Serb and Croat paramilitaries.

On 6 May, the 1991 protest in Split against the siege of Kijevo at the Navy Command in Split resulted in the death of a Yugoslav People's Army soldier.

System 7 is a graphical user interface-based operating system for Macintosh computers and is part of the classic Mac OS series of operating systems. It was introduced on May 13, 1991, by Apple Computer, Inc.

On 15 May, Stjepan Mesić, a Croat, was scheduled to be the chairman of the rotating presidency of Yugoslavia. Serbia, aided by Kosovo, Montenegro, and Vojvodina, whose presidency votes were at that time under Serbian control, blocked the appointment, which was otherwise seen as largely ceremonial.

On 19 May 1991, the Croatian authorities held a referendum on independence with the option of remaining in Yugoslavia as a looser union. Serb local authorities issued calls for a boycott, which were largely followed by Croatian Serbs. The referendum passed with 94% in favor.

Boeing 767-3Z9ER, On May 26, 1991, Lauda Air Flight 004, broke up in midair over a remote area of Thailand due to an uncommanded deployment of a thrust reverser on one of the plane's engines, killing all 213 passengers and 10 crewmembers aboard. The flight, which originated at Kai Tak Airport, Hong Kong, and made a stopover at Don Mueang International Airport in Bangkok, Thailand, was en route to Vienna International Airport, Vienna, Austria when the accident occurred.

The newly constituted Croatian military units held a military parade and review at Stadion Kranjčevićeva in Zagreb on 28 May 1991.

In the 1990–91 season, Jordan won his second MVP award after averaging 31.5 ppg on 53.9% shooting, 6.0 rpg, and 5.5 apg for the regular season. The Bulls finished in first place in their division for the first time in 16 years and set a franchise record with 61 wins in the regular season.