June 30: Calgary police issue an Amber Alert after five-year-old Nathan O'Brien and his grandparents, Alvin and Kathryn Liknes, are reported missing.
July 1:Police express interest in speaking to anyone who attended an estate sale at the Liknes home on the weekend leading up to the disappearances.
July 2:Nathan's parents, Rod and Jennifer O'Brien, issue a nationally televised plea for their son's safe return.
July 4:Police confirm that a violent incident took place at the Liknes home, adding they recovered forensic evidence. They also release images of a green Ford pickup truck and say they believe the unidentified driver may have some information.
July 5:Calgary police and RCMP descend on a property near Airdrie, Alta., just north of Calgary. Police recover the green Ford and take in Douglas Garland for questioning.
July 6: Mr. Garland, 54, is released, but still publicly declared a person of interest.
July 7:Mr. Garland appears in a Calgary court on an identity theft charge unrelated to the Liknes/O'Brien disappearance. He is held in police custody pending a bail review.
July 10:Police say they are probing business dealings in the Liknes family as part of their investigation. Officers do not provide details, but reports surface that Alvin Liknes recently had to close his gas exploration company after equipment was seized for unpaid taxes. Police say they have also begun searching other city landfills. Later that day, about 500 people attend a candlelight vigil at a community centre near the Liknes home.
July 11:Mr. Garland is released from police custody on bail and given strict conditions, including instructions not to return to his parents' Airdrie farm where police are still conducting searches.
July 14:Police say two charges of first-degree murder and one charge of second-degree murder are pending in the case, but don't immediately identify the suspect because charges have not been laid.
July 15:Police say Douglas Garland has been charged with first-degree murder in the deaths of Alvin and Kathryn Liknes, and second-degree murder in the death of Nathan O'Brien.