Kandis S. Rinn, 42, of Marengo.

Attempted murder charges have been filed against a mother who allegedly stabbed her adult son, seriously injuring him, during a dispute near Marengo last month.

Kandis S. Rinn, 42, of the 19000 block of Ridge Lane in Marengo, was initially charged with aggravated domestic battery, a Class 2 felony, and aggravated battery using a deadly weapon, a Class 3 felony.

On Friday, court records showed that one count of attempted murder, a Class X felony, had been filed against Rinn.

McHenry County Sheriff’s Deputy Tim Creighton said sheriff’s deputies responded to Rinn’s residence in the 19000 block of Ridge Lane in unincorporated Marengo on February 21.

A domestic incident between Rinn and her adult son escalated when Rinn stabbed the man with a knife, Creighton said.

A criminal complaint alleges that Rinn “performed a substantial step towards the commission” of murder.

The victim was treated by paramedics and flown by medical helicopter to Javon Bea Hospital in Rockford with serious injuries in stable condition.

Police believe alcohol was a factor and they said it was an isolated incident.

Deputies arrested Rinn and transported her to the McHenry County jail where she remains held on a $250,000 bond. She will have to post $25,000 cash to be released on bail.

Rinn, who was appointed a public defender, is scheduled to appear in court on March 10 for a bond hearing.