No. Chris Cornell was never part of th Stone Temple Pilots. He was a musician, singer, and songwriter, best known as lead vocalist for the bands "Soundgarden" and "Audioslave".
Born on July 20, 1964, in Seattle, Cornell co-founded Soundgarden with Hiro Yamamoto, Kim Thayil and Matt Cameron in 1984. The band was among the most influential of the early grunge scene, achieving multi-platinum sales with Superunknown in 1994 before disbanding two years later. He went on to enjoy more success with Audioslave and as a solo artist, before reuniting with Soundgarden in 2010.
On the other hand, Stone Temple Pilots members are Dean DeLeo (guitar); Robert DeLeo (bass); Eric Kretz (drums); Scott Weiland (vocals). The group was formed in San Diego, CA in 1987 and was originally named "Mighty Joe Young".
In the news, sadly, Cornell committed suicidè while on tour with the group in Detroit on Wednesday, May 17, 2017, at the age of 52.
Chris Cornell Dead: Here are 5 Fast Facts You Need to Know shared by Heavy.com.