DEDHAM, Mass. (Court TV) — Jurors hearing evidence that allergy doctor Dirk Greineder killed his wife in favor of a secret life of pornography and call girls heard a lot more about hardware Tuesday than they might have imagined when picked to sit on the salacious murder trial.

The prosecutor who claims Greineder murdered his wife of 31 years in October 1999 with a hammer and knife called three witnesses to the stand to testify that the 2-pound drilling hammer used to bludgeon Mabel "May" Greineder was a specialty tool and not a big-selling item at hardware stores near Greineder's Wellesley home.

On Sept. 3, 1999, someone purchased one of the unique Estwing hammers at F. Diehl and Son Inc, a hardware store in Wellesley, within three minutes of the purchase of nails linked to the Greineder household by a receipt.

A fourth witness testified that brown work gloves found in a doghouse behind the couple's house appeared to be the same style and brand of Chinese-made gloves found near the crime scene and sold at a local hardware store where Greineder was known to shop.

The testimony, which followed the presentation of physical evidence that prosecutors say links the 60-year-old doctor to the gloves worn by his 58-year-old wife's killer, is being put before the 14-member jury in a steady and methodical pace by prosecutor Richard Grundy. He seems to be trying to show the jury that the police were thorough in their examination of both physical and circumstantial evidence before charging Greineder with first-degree murder.

Greineder maintains that his wife was murdered in the Morse's Pond Recreation Area after the couple split up for about 10 minutes during a walk on Oct. 31, 1999. Mabel Greineder insisted that her husband continue on to exercise the family dog while she sat and rested her sore back, according to the defense's version of events.

Police doubted Dirk Greineder's story early on in the investigation but waited until a grand jury indicted him before making the arrest on Feb. 29, 2000. By then, police had found the hammer, knife and gloves used by the killer in a storm drain near the crime scene. A witness testified that she saw Dirk Greineder emerge from the path where the storm drain is located.

Massachusetts State Police crime lab analysts have already testified that both Mabel and Dirk Greineder's DNA was found on the bloody gloves. The Greineders' niece, Belinda Markel of New York City, Tuesday became the second witness to testify that Dirk Greineder offered a theory of how his DNA could have gotten on the killer's glove. She said he told her the couple shared a towel after both suffered spontaneous nosebleeds as they headed out for Morse's Pond.

Markel also testified Tuesday that she observed bruises on her uncle's arm when she went to see him at the Wellesley Police station after the killing. Greineder could not explain how he got them, she said.

"There were three or four small marks on the inside of his arm," Markel said. "They were the size of a dime."

On Monday, Markel provided testimony that Grundy may highlight later in his summation to the jury of eight men and six women. According to Markel, Greineder took her aside in his study and confided that he had sex with his wife on the morning of the murder; a Massachusetts State Police homicide investigator previously testified that Greineder told him that he and his had not been sexually active for years because she had a bad back.

"He said they had had sex that morning but there was nothing wrong with that because they were married," Markel said. "I said, `Right,' but I was shocked because in all the time I'd known him I'd never had that direct a conversation with him."

Having gone through all but blood-splatter evidence, Grundy is expected to shift the prosecution's focus to Greineder's secret sex life on Tuesday afternoon or Wednesday. Using the alias "Thomas Young," borrowed from a college acquaintance, Greineder ran up huge phone sex bills and had sex with women from escort services in hotels, prosecutors have alleged.

Defense attorney Martin Murphy argued in his opening statement last month that Greineder's sexual pursuits were not relevant to the murder charge and insisted that the prosecution is only making them an issue because they needed to contrive a motive to support a weak case.

Judge Paul Chernoff ruled that the prosecution can present evidence of Greineder's kinky lifestyle but limit it to events within a week of the killing. At least one of the women Greineder allegedly paid for sex is expected to testify.

Testimony resumes at 1 p.m. ET. The trial is being broadcast by Court TV.