24 July 1975 (Thursday)
4 PM: Kathy is at home with her mother (Mrs. Beatty) . She had been inside all day watching television and asks her mother if she can go outside and ride her bike.
Her mother says yes she can, but invites her to travel to Baltimore to attend a Maryland Lottery dinner drawing that evening. Kathy declines, so her mother tells her to fix her own supper when she returns from her bike ride.
Her mother tells Kathy that she will be home by 9 PM. She expects Kathy to be home by 8:30 PM, because she was always in by sun down.
6:30 or 7 PM: A boy who lives next door stops by to see Kathy at home. He had brings her a shirt from Ocean City, chats with her awhile, then leaves.
About 8:30 PM: Near Parkland Junior High School, Kathy is seen walking alone by several known youngsters about Kathy's age. Although they later say that they saw her at the school, none of them claim that they were with her. They later refused to take polygraph tests.
Some time after 8:30 PM: Kathy receives a fatal blow to her head and is left lying behind the K-Mart at Georgia and Connecticut Avenues.
11 PM: Mrs. Beatty returns home. The house is dark and Kathy is not at home. When she turns on the lights there is a note from Kathy saying she has gone to a friend's and will be back at 10 PM. It is raining, and Kathy's mother assumes her daughter is waiting for a ride home.
All night long her mother searches for Kathy. Including contacting homes of some of her friends. Kathy is not located. The father of a "boyfriend" goes out to a camper in his backyard to ask his son if he has seen Kathy, but finds that his son and his son's buddy are not in the camper.
25 July 1975 (Friday)
7 AM: The "boyfriend" calls Kathy's home to state that he has not seen her.
Early morning, sometime after 7 AM: Kathy is found by her sister Theresa and Theresa's boyfriend in a trash-filled, rocky place, near a drainage ditch or stream. This was a large, vacant area adjacent to the K-Mart and its parking lot.
Kathy is unconscious, suffering from a with a depressed fracture of the skull. She is barely alive. Kathy had been sexually assaulted but not raped. Her purse is found nearby.
Found beside Kathy are a set of keys. The keys do not belong to Kathy, and investigators suspect that they may have been dropped by her assailant.
Kathy is taken to Suburban Hospital by ambulance. In the hospital, Kathy never regains conciousness.
5 August 1975 (Friday)
Kathy dies of complications from her injuries, including blood poisoning in the Intensive Care Unit at Suburban Hospital.
6 January 1977: Washington Post Article about Kathy's murder, which remains unsolved.
1987: Fred Howard Coffey, Jr. a convicted child molester and murderer comes to the attention of Montgomery County Police as a possible suspect in Kathy's murder, but lack of evidence prevents them from charging him. In July 1975, Coffey had been working for Vitro Laboratories, which had four offices in the Wheaton/Aspen Hill/Rockville Maryland area. The parking lot of one Vitro Office is located between Kathy's house and the K-Mart where she was found.