Authorities found the father and daughter in late November, bound with duct tape and shot, following what appeared to be a robbery of the farmhouse in Fort Recovery where they lived. Colleen, 47, lived there and took care of Robert, 70, who was disabled.
The elder Grube was wheelchair bound because of a stroke.
On Tuesday, Rhoades was arrested at the same address where a suspected meth lab was raided in January 2012. Four people, including Rhoades, were arrested after that raid.
Rhoades is the first suspect charged in the Grube killings. By Wednesday morning, authorities said they are expected to announce the name of a second suspect. Mercer County Sheriff Jeff Grey plans to hold a news conference at 9 a.m.
Another person, a woman, is also reportedly being sought by investigators.
According to Mercer County Prosecutor Matthew K. Fox, the charge against Rhoades stems from an incident on June 4, 2012. A press release indicates Rhoades lied to investigators.
Investigators have said that two people, maybe more, came to the Grubes’ home at 2216 Burrville Road, just east of Fort Recovery, between 5 p.m. Nov. 29 and 9 a.m. Nov. 30, bound them and shot them.
Investigators then determined that at least one man and one woman were present during the killings. They were either let in or came in through an unlocked door, and they ransacked parts of the house and stole a laptop computer.
The Mercer County Sheriff’s Office worked on the Grube case along with investigators from the state’s Bureau of Criminal Investigation and Identification.
Nearly 100 people were interviewed. Investigators would meet weekly to discuss theories and suspects.
In January 2012, it was reported that 63 court orders and/or subpoenas had been issued. Additionally, 11 search warrants had been issued and 17 new pieces of evidence were recovered.
News Center 7’s Cheryl McHenry will have more information in a live report beginning at 6 p.m.