Osama bin Laden, the suspected mastermind behind the September 11 attacks and the FBI's most wanted man is killed by US special forces in Abbottabad, Pakistan
- The 2011 E. coli O104:H4 outbreak strikes Europe, mostly in Germany, leaving more than 30 people dead and many others sick from the bacteria outbreak.
Day of the Week: Monday
How Long Ago? 10 years, 2 months and 17 days
Leap Year: No
Holidays: May Day (Ireland, United Kingdom)