Three weeks have passed since three people were killed on Harding Avenue, and Patch is taking a look back about how developments unfolded. Note: Times are approximate.

Monday, Sept. 12, 5 p.m.: Patch got word of police responding to a crime scene at 12 Harding Ave. Patch editor Ryan Grannan-Doll headed to the scene.

5:44 p.m.: Patch confirms that authorities were investigating the death of three people in the Harding Avenue home.

6:47 p.m.: Middlesex County District Attorney Gerry Leone arrives at the scene where he is briefed by investigators.

10:11 p.m.: Leone briefed the gaggle of reporters saying three people had been found dead in a “very graphic” scene and that two people had been in the apartment prior to the murders.

Tuesday, Sept. 13

5:45 a.m.: Geoffrey Langton, a neighbor to the scene of the murder, tells reporters the victims were covered in marijuana.

Wednesday, Sept. 14

2:38 p.m.: The DA’s office identifies the three victims, including one Waltham man.

Thursday, Sept. 15

4:29 p.m.: The DA’s office confirms the three victims were killed by “sharp force injuries of the neck.”

Friday, Sept. 16

Waltham officials spoke out about how the Harding Avenue neighborhood was coping with the tragedy.

Friday, Sept. 23

Patch reports that Geoffrey Langton was arrested for trying to steal pot from several people before threatening to kill a friend.

Monday, Sept. 26

A look back at recent Waltham murders observes that most are targeted killings, instead of random acts of violence.