Nearly three years after Holly Grim's disappearance, Pennsylvania State Police believe her former co-worker, Michael Horvath, is responsible for her death.

At a news conference held in Hamilton Township, Monroe County, on Thursday, authorities revealed a number of details that led to Horvath's arrest.

Horvath was originally interviewed shortly after Grim went missing in November of 2013 because he and Grim worked together for seven years at Allen Organ Company.

Read: Criminal complaint against Michael Horvath

Horvath was reported as being late for work on the day of Holly’s disappearance which he told police was due to a flat tire.

Horvath was re-interviewed in June 2014 and said he had been at Grim’s residence to transport a clothes washer and dryer and help her carry them into the residence. He provided a DNA swab to investigators on that date which later was matched to a bloodstain found on an outside door of Grim’s residence at the time she disappeared.

Investigators did not say what led them to execute a search warrant for Horvath's property at 2368 Woodhaven Drive in Ross Township on September 27, 2016.

Watch: Press conference on Holly Grim disappearance investigation

They did, however, reveal that they were able to uncover a lot of evidence, including skeletal remains. DNA testing then matched those bones to Holly Grim. The bones were found shallowly buried on his property.

Lehigh County District Attorney Jim Martin announced two kidnapping counts have been filed against Horvath bacause investigators believe Grim was abducted from her residence in Lehigh County, however, they do not necessarily think she was murdered there.

Martin said he thinks the homicide case should go forward in Monroe County. He will condense the kidnapping charges with the homicide charges in Monroe County.

A motive was not discussed, however, a planner with handwritten notes about stalking was found. Investigators believe that planner belonged to Horvath.

Concerning the focus of Horvath as a suspect, investigators said a lot of people were interviewed but the investigation kept coming back to Horvath and following the evidence ultimately led to his arrest.

Horvath was taken into custody by the State Police Thursday morning and was arraigned via video conference. He is currently incarcerated without bail in the Monroe County Correctional Facility and will have a preliminarily hearing October 24th.

Allen Organ Company, where both Grim and Horvath worked together, released the following statement:

At Allen Organ Company, we pride ourselves on the quality of our products, our services, and most importantly, our employee family.

In light of this recent announcement concerning a tragedy, we want to offer support to Holly's family.

We would ask the media to respect their privacy as they deal with this tragic announcement. Holly’s Allen Organ family grieves with the Grim family.”