The DNA analysis used to link a Chester County man to the killing of his father has been discounted upon further testing, according to testimony Thursday.

Parth Ingle, 26, and his mother, Bhavnaben Ingle, 52, are charged in the 2008 death of Arunkumar Ingle, who was found dead in his bedroom in Middletown Township, Delaware County. He had multiple stab wounds and his testicles were badly bruised, according to police. His alleged killers were in court Thursday for a pretrial hearing before Delaware County Court Judge Barry C. Dozer.

Samples taken from a sink drain in Parth Ingle's South Coventry home were initially thought to match Arunkumar Ingle's DNA. When the samples were sent back to a lab in Greensburg, Pa., for a more sophisticated test not originally available, the results determined it was "100 quintillion times less probable" that the DNA belonged to Arunkumar Ingle than that it was a coincidental match, according to an e-mail from prosecutors that John Kusturiss, Parth Ingle's defense attorney, read in court.

The victim, a 55-year-old Boeing engineer, was having an affair with a Russian woman he met on the Internet. According to authorities, he planned to obtain phony passports, fake his own death, and move to India with her.

The woman, Anna Sudakevich of Philadelphia, testified that she did not learn the victim was married until Parth Ingle came to her house looking for his father.

Arunkumar Ingle's plan was to leave behind $3.6 million in insurance policies for his wife and children, authorities have said.

Prosecutors said financial gain and retribution were the motives for the killing. Parth Ingle was about $43,000 in debt at the time.

On Thursday, prosecutors introduced evidence of a letter that Parth Ingle allegedly wrote to relatives in India asking them not to contest an insurance settlement so the Ingle family could get the money.

When questioned, Trooper Robert Kirby said there was no evidence the letter was sent.

Also Thursday, the court heard the dramatic 911 call Bhavnaben Ingle made when she reported discovering her husband's body. She could be heard screaming as 911 operators tried to calm her.

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DNA test linking son to death of Chester County man is discounted