Investigations into the death of Dellen Millard's father and disappearance of his former girlfriend have brought police back to Millard's North Dumfries farm, police tell CTV News.

Toronto homicide investigators returned Tuesday to the farm south of Kitchener, which had been subject to police scrutiny in relation with the death of Tim Bosma.

Millard's father, Wayne Millard, died last November in the home he shared with his son. The death was initially ruled a suicide and the remains were cremated.

Laura Babcock, Millard's former girlfriend, was last seen in June 2012 in Toronto’s Roncevalles neighbourhood.

There were about 10 officers on the property Tuesday – two from Toronto’s homicide unit along with OPP and Waterloo Regional Police.

A backhoe and a ground-penetrating radar device were among the items police were seen using.

The investigations into Babcock and the elder Millard were tied to Dellen Millard following his arrest in the case of Bosma, who was last seen leaving his Ancaster home for a test drive on May 6.

Bosma’s burnt remains were later found on the farm property, along with an incinerator.

According to police, phone records show a number of calls between Babcock and Dellen Millard, including the last call made from Babcock’s phone before she disappeared.

Police say they are following up on information received and looking at a particular piece of land, but don’t know what if anything they will find.