List of Strikeforce champions
Welterweight Championship

No.
Name
Event
Date
Defenses
1
United States Nick Diaz def. Marius Žaromskis
Strikeforce: Miami Sunrise, FL, USA
January 30, 2010
1. def.
The title was vacated on June 9, 2011 when Diaz's contract was absorbed by the UFC.
The title was vacated on June 9, 2011 when Diaz's contract was absorbed by the UFC.
The title was vacated on June 9, 2011 when Diaz's contract was absorbed by the UFC.
The title was vacated on June 9, 2011 when Diaz's contract was absorbed by the UFC.
The title was vacated on June 9, 2011 when Diaz's contract was absorbed by the UFC.
2
United States Nate Marquardt def. Tyron Woodley
Strikeforce: Rockhold vs. Kennedy Portland, OR, USA
July 14, 2012
-
3
Belgium Tarec Saffiedine
Strikeforce: Marquardt vs. Saffiedine Oklahoma City, Oklahoma, USA
January 12, 2013
-
The Strikeforce Welterweight title was vacated after the Strikeforce banner was dissolved into the UFC on January 12, 2013.
The Strikeforce Welterweight title was vacated after the Strikeforce banner was dissolved into the UFC on January 12, 2013.
The Strikeforce Welterweight title was vacated after the Strikeforce banner was dissolved into the UFC on January 12, 2013.
The Strikeforce Welterweight title was vacated after the Strikeforce banner was dissolved into the UFC on January 12, 2013.
The Strikeforce Welterweight title was vacated after the Strikeforce banner was dissolved into the UFC on January 12, 2013.

Question: What happened to Nick Diaz's welterweight championship tittle in 2011?
Answer: Nick Diaz vacated his Strikeforce Welterweight Championship title.