Career
He teamed up with Babers in the 4×400-meter relay event and he led the team home to victory, winning his first Olympic gold medal. He ran at the 1987 World Championships in Athletics, but was eliminated in the quarter-finals. He retained his 400 m indoor title at the 1989 IAAF World Indoor Championships, setting a championship record of 45.59 seconds in the process.
In 1989, McKay became the first Black track and field athlete to compete for the New York Athletic Club, which had historically banned Blacks and Jews from membership.
He failed a doping test in 1990 for the banned stimulant phenylpropanolamine. After initially being banned for three months, the ban was overturned on the defense that neither McKay nor the doctor who had prescribed him a flu remedy where aware that the banned substance was contained in the medicine.
McKay retired from competition around 1994. He remains the joint United States and Panamerican record holder in the rarely competed indoor 4 × 200 m relay, which he set in 1991 in Glasgow, Scotland alongside Thomas Jefferson, Raymond Pierre and Kevin Little.
He now works as a track coach at North Springs High School, a public high school in Sandy Springs, Georgia.
Coached the Dunwoody High School Girls Track and Field 5AAAAA Team to the State Championships for the 2012–2013 Season. 1984 Indoor World Record Holder.