Calgary Police have now charged a 20-year-old man they arrested on Thursday with second-degree murder in connection with the murder of Lukas Strasser-Hird.

Officers escorted the Assmar Ryiad Shlah into the Arrest Processing Unit late Thursday night.

He has been charged with second degree murder.

Emergency crews were called to an alley in the 200 block of 10 Avenue S.W. at about 2:45 a.m., on Saturday, November 23, 2013, for reports of a man needing medical assistance.

They found the man suffering from critical, life-threatening injuries and transported him to hospital, where he later died.

An autopsy confirmed that Lukas Strasser-Hird, 18, died as a result of stab wounds.

Police believe Strasser-Hird was involved in two altercations prior to his death.

Three people are already facing charges in connection to Strasser-Hird’s death:

Nathan Paul Gervaise, 18, of Calgary, is charged with first-degree murder

Franz Emir Cabrera, 19, of Calgary, is charged with second-degree murder

Joch Pouk, 20, of Calgary, is charged with second-degree murder

Police are still seeking help from the public in connection with the crime. They believe that many people may have pictures or video of the altercation and police are asking those people to come forward with what could be considered to be valuable evidence.

They are asking for any videos to be sent to a special email address that has been established for the investigation to homicidetips@calgarypolice.ca.

Photographs can also be sent to this address or anonymously through Crime Stoppers using their online tips form at tttTIPS.com.

Anyone with information about this case to contact police at 403-266-1234 or Crime Stoppers anonymously using any of the following methods:

TALK: 1-800-222-8477

TYPE: tttTIPS.com

TEXT: tttTIPS to 274637