41 year-old Mr Michalkiewicz had last been seen alive outside his apartment at around lunchtime on Monday the 14th of May
He was found two days later with multiple stab wounds in what gardai are describing as a brutal murder.
Searches have been carried out around the town and a number of people have been question about the murder - but no arrest have yet been made.
Gardai continue to appeal to anyone with information to come forward.
Gardai made this appeal last Thursday which is also given in Polish.