Dr. David Waxman, executive vice chancellor of the Kansas University Medical Center since 1977, planned to retire from that position at the end of the 1982-83 academic year. Waxman, 64, had to step down as the medical center’s top administrator because of the mandatory retirement age of 65 for administrators. He was to be 65 the coming February.

A Douglas County teenager pleaded guilty to reduced charges in connection with the June killing of her great-uncle. Lisa Bigenwalt, 18, pleaded guilty to aiding and abetting voluntary manslaughter. She earlier had been charged with first-degree murder, attempted kidnapping and aggravated robbery in connection with the death of Donald Hatchell, 49. Bigenwalt’s companion, William McTaggart, 15, earlier had been judged delinquent and was placed at the Kansas Youth Center. The body of Hatchell had been found partly buried beneath a bridge in southwestern Douglas County.