This is pretty neat to bring someone like him back. I remember him well. He signed a big contract with the Chiefs in 1998. Well, big by 1998 (and still big today by my standards): Five years, $17.5 million. I found the AP story from March 3, 1998 on his signing which you can read here.
Alexander spent four seasons with the Chiefs from 1998-2001. His best season came in 2000 when he finished with 78 catches, 1,391 yards and 10 touchdowns. Overall, he had 3,600 yards and 19 touchdowns during his time in Kansas City. Not too shabby.