Bennington was discovered dead in Los Angeles on Thursday morning, having taken his own particular life at 41 years old.
The American vocalist was a dear companion of Cornell, who himself conferred suicide by hanging in May.
Check Out: Chester Bennington Tribute
"I can't imagine the world without you in it," Bennington wrote.
"I pray you find peace in the next life."
— Chester Bennington (@ChesterBe) May 18, 2017
Bennington composed an open letter to Cornell upon the arrival of the Soundgarden frontman's suicide.
He later performed Leonard Cohen's Hallelujah at the burial service.
Thursday would have been Cornell's 53rd birthday.
Cornell's better half, Vicky, tweeted out a message following the news of Bennington's demise, saying: "Just when I thought my heart couldn't break anymore ... I love you, T.
Shocked and heartbroken, but it's true. An official statement will come out as soon as we have one.
— Mike Shinoda (@mikeshinoda) July 20, 2017
Bennington was twice hitched, with six kids.
The vocalist battled with medications and liquor for quite a long time. He had said in the past he had considered submitting suicide since he had been manhandled as a tyke by a more seasoned male.
The band, framed in 1996, has had a series of hits throughout the years, including Faint, In the End, and Numb.