A 19-year-old man arrested in connection with a home invasion robbery at a Waialae Nui home was allegedly involved in a burglary in Waikiki two months ago.

Police picked up Zachary T. Robinson in Waikiki at 11 a.m. Thursday on warrants related to the earlier burglary.

The arrest came less than eight hours after officers found two victims, 85-year-old Mary Lee Koskinen and 40-year-old Matthew Edmondson, inside a Waialae Nui home at 3:30 a.m. Both had been beaten and were in critical condition at the Queen's Medical Center yesterday.

After questioning Robinson for several hours at the main police station, police arrested him at 11 p.m. Thursday night on sus- picion of first-degree robbery, first-degree attempted murder and two counts of second-degree attempted murder. Charges are pending.

“;There's no reason to believe that this was a random act,”; Police Chief Louis Kealoha said yesterday at a news conference.

He declined to give details on what led police to the suspect or what the motive might have been but said drugs were found at the scene.

Neighbors described Koskinen as a frail woman who suffers from dementia. Edmondson is Koskinen's caretaker.

Neighbors also said Edmondson's behavior had changed in the last year and said they suspected he was using drugs.

Police described Robinson as a “;known character in the Waikiki area”; and said he is a suspect in several burglary and theft cases in Waikiki.

Court records show Robinson was arrested two months ago on suspicion of first-degree burglary in connection with a Nov. 3 theft at Royal Aloha Condominium at 1909 Ala Wai Blvd. He and another man were seen entering the building several minutes after 7 a.m. The burglary occurred in a sixth-floor apartment while three residents were asleep.

Surveillance cameras caught Robinson and the other man leaving at about 7:20 a.m. Robinson was observed wearing a gray hoodie and carrying a computer, both of which belonged to residents of the apartment, court documents say.

More than a dozen items worth an estimated $3,300 were stolen. Some of the items included a Macbook Pro laptop computer, $570 in cash, jewelry, clothing, a cell phone and a debit card.

The day after the burglary, police arrested Robinson at a room at the Aston at the Waikiki Banyan on Ohua Avenue.

Authorities placed him under supervised release of his mother, who lives in Kailua. The conditions of his release included a curfew between the hours of 6 p.m. and 6 a.m. and to stay away from Waikiki. His mother could not be reached for comment.

Robinson was described to be homeless at the time of the November burglary. His mother told authorities he was living with her up until a few weeks before his arrest. Robinson, born in Florida, has been living in Hawaii since 2005.