An MIT police officer allegedly killed by the Boston Marathon bombing suspects was remembered Friday as a dedicated police officer and someone who worked daily to make the world a better place.Watch reportMIT officer Sean Collier, 26, was shot and killed in his cruiser allegedly by marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev as they attempted to take his service weapon and flee the area on April 18, 2013."Although it came at awful price, I now know heroes still walk on God's earth," a tearful MIT Police Chief John DiFava said at a memorial service Friday.Photos:  Sean Collier memorial serviceThree people were killed and more than 260 others were injured when a pair of pressure cooker bombs exploded near the finish line of the Boston Marathon on April 15, 2103.Collier was killed three days later, hours after the FBI released photos and video identifying the Tsarnaev brothers as the bombing suspects.Cambridge Police Department honors Sean Collier"I've been a member of law enforcement for more than 40 years, and Sean was as good as I have ever seen, and probably better than most," said MIT Police Chief John DiFava.DiFava said the support of the community and the university has helped the MIT Police Department get through the last 12 months."This is a tough day for us. We, the MIT police, lost an officer; the MIT community lost a member -- a contributing member, an important member and someone who is going to be real hard to replace," DiFava said.Collier was the fifth of six children. He studied criminal justice at Salem State University and worked for a time as a civilian at the Somerville Police Department."Sean was taken from us from a moment of extreme evil, but that never defined how we remember him on this campus. When Sean left, love rushed in," said MIT student Sara Ferry.Collier was a Boston Celtics fan, taught young people to box and volunteered at a homeless shelter."This is tough. I said it before, and I'll say it again: If my daughter ever walked home with somebody like him, then I did a pretty good job as a father," DiFava said.During Friday's memorial ceremony at MIT, Cambridge Mayor David P. Maher said the intersection of Main and Vasser streets will be named Sean Collier Square in his memory.J. Meejin Yoon, an associate professor of architecture at MIT, said work on a permanent memorial designed as a place for reflection will soon begin. A temporary memorial now stands at the spot where Collier was killed.In his memory, Team Collier Strong, a group of 25 friends and family members, will run the marathon to raise money for a scholarship fund."Our jerseys have 179, which was his badge number. We had it put on the back of our jerseys so we know he's running with us and he's got our back,"  Collier Strong runner Kris Brewer said.