Knorr's third child, Suesan Marline Knorr, was born on September 27, 1966. The couple had three more children: William Robert Knorr on September 15, 1967; Robert Wallace Knorr, Jr. on December 31, 1968; and Theresa "Terry" Marie Knorr on August 5, 1970. Theresa and Robert Knorr's marriage began to deteriorate after Theresa began accusing her husband of having affairs. Both Theresa and Robert were known to be volatile and would constantly beat each other and the kids. Fed up with Theresa's constant accusations, Knorr left her in December 1970 and was granted a divorce in 1971. After the divorce, Robert Knorr attempted to see his children but Theresa prevented him from doing so.