The 64-year-old Martinovic died on March 20 after he fell into a coma while taking a walk with his dog near a canal carrying sewage from the Karlovacka Pivovara brewery in Karlovac on 23 February. The dog died on the spot.
Investigating judge Jasminka Jerinic Musnjak has also received reports from other relevant institutions and requested additional tests from the Institute of Veterinary Science.
Five employees of the Karlovac brewery and the brewery as a legal entity are under investigation on suspicion of threatening public security with a dangerous activity or substance having fatal consequences.