In September 2001, Haas had a heart attack, and in December, died in his sleep at the age of 27. Following his death, several wrestling personalities paid tribute to Haas, including Low Ki and Kevin Kelly. JAPW held the Russ Haas Memorial Show in February 2002, and in August 2002 Phoenix Championship Wrestling held The Russ Haas Memorial Tag Team Tournament. In 2004, he was inducted into the ECWA Hall of Fame and in 2007 he was inducted into the JAPW Hall of Fame.
The Haas brothers began competing for Combat Zone Wrestling (CZW) in November 1999, losing to The King Pinz at The War Begins on November 20, 1999.[7] They competed regularly for CZW throughout early 2000, and won the CZW World Tag Team Championship on February 12 at Climbing The Ladder by defeating The Kashmerino Brothers and The Thrill Kill Kult in a three-way match.[8][9] On July 10, they lost the championship to The Backseat Boyz at Caged To The End, when Johnny Kashmere defeated Russ in a singles match and was awarded the championship.[8][10]
On September 24, 2001, Haas had a heart attack.[1] On December 15, 2001, he died of heart failure in his sleep at the age of 27.[1][12][13] He was found dead by his wife Deedra shortly after his brother Charlie had left for the night.[1] Haas was buried at Memorial Oaks Cemetery in Houston, Texas.
Following Haas's death, Charlie wrestled by the ring name "R.C. Haas", adding Russ's name in front of his own and initializing both, in tribute to his brother until he was called up to the WWE main roster. Charlie also began wrestling with "RUSS" written on his wrist tape, this act of tribute lasting up to this day.[13] On December 15, 2001, CZW's Cage of Death 3 show had a ten bell salute for Haas, with some wrestlers wearing black armbands, and others taping "RH" on their wrestling boots.[14] On December 17, 2001, on Raw, both Jim Ross and Jerry Lawler paid a small tribute to Haas in the middle of the show.[5] Both William Moody and Kevin Kelly paid tribute to Haas on their websites.[5] On July 17, 2002, first ever Ring of HonorChampionLow Ki dedicated his title win to Haas.[15]
On February 2, 2002, JAPW held the Russ Haas Memorial Show, with the JAPW roster donating their services for the event.[5] In his honor, Mike Bucci and Charlie had the idea to have local indy talent and talent from Ohio Valley Wrestling and World Wrestling Entertainment, who were touched by Haas' death, put on a special tag-team tournament. The Russ Haas Memorial Tag-Team Tournament was held by the small New Jersey–based promotion Phoenix Championship Wrestling on August 31, 2002.[16] There were eight teams in all, but in the end, the team of Bucci and Charlie won the tournament.[13]
Haas was part of the 2004 class of inductees into the ECWA Hall of Fame, with his brother Charlie.[17] On October 27, 2007, Haas posthumously was inducted into the JAPW Hall of Fame.[18]