A Delaware County mother and son are expected to pleaded guilty today to manslaughter in the stabbing and beating death of the family's patriarch, police said.

Bhavnaben Ingle and Parth Ingle, were originally charged with first-degree murder, aggravated assault, and related crimes in the nearly five-year-old case.

On, Jan. 21, 2008, the body of 55-year-old Arunkumar Ingle was found in the bedroom of the family's Middletown Township home. He had multiple stab wounds, his face was beaten and his testicles were mutilated.

From the start, police said Arunkmar Ingle knew his killer. There were no signs of a break-in.

Court records revealed the 55-year-old Boeing engineer had planned to get a counterfeit passport, fake his own death and move to India with a woman he met over the internet. He had had obtained $3.6 million in insurance policies, and listed family members as beneficiaries.

In Dec. 2011, Parth Ingle was found guilty of putting spyware on his father's computer to capture passwords to e-mail accounts and was sentenced last December to two years' probation.

His sister, Avnee Ingle, was acquitted at trial.

With in weeks, Parth Ingle and then his mother were arrested for murder.

Prosecutors said the motive for the heinous crime were financial gain and retribution. Parth Ingle was $43,000 in debt.

The plea is expected before Judge Barry C. Dozer this afternoon.

Contact staff writer Mari A. Schaefer at 610-892-9149, mschaefer@phillynews.com or @MariSchaefer on Twitter.