Friends and colleagues described 64-year-old Florida woman killed in a knife rampage in central London as a retired special education teacher who enjoyed tennis and doted on her husband.

Darlene Horton was enjoying time overseas with her husband, Rick Wagner, a Florida State psychology professor who had been teaching in the university's summer program. The Tallahassee Democrat (http://tinyurl.com/zq2sjk2 ) reported that the semester ended Wednesday, and couple was slated to return soon.

Officials say Horton died at the scene. Five others were injured by a Somali-Norwegian teenager wielding a knife earlier this week.

Friends was quoted as saying Wagner and Horton were devoted to the study abroad program and had been traveling overseas for several years.