DEDHAM, Mass. (Court TV) — As firefighters and paramedics gathered around his wife's dead body, Dirk Greineder fell to his knees, his thin hair disheveled and his clothes stained with her blood, and shouted in despair, according to a firefighter.

A frantic Greineder cried out, "This is my wife. This is my wife. Who could have done this to her?" the firefighter, William Delorie, told the jury during the second day of the renowned allergy specialist's first-degree murder trial.

The powerful testimony came during a lengthy cross-examination by defense lawyer Martin Murphy. Earlier, prosecutor Richard Grundy scored points of his own during direct questioning, when Delorie recalled other remarks made by Greineder after the killing that seemed to clash with claims the defense attorney made during opening statements on Thursday.

"He told me that he'd been walking with his wife and dog and his wife had hurt her back and he had gone ahead to retrieve the dog," Delorie testified.

Mabel Greineder was bludgeoned over her head and slashed across the neck in a tranquil suburban park on the morning of Oct. 31, 1999. The prosecution says Greineder killed his wife so that he could more freely pursue his secret obsessions with pornography and prostitutes.

Scene where Mabel Greineder's body was found.

Murphy claimed during his opening statement that his client's wife had hurt herself while descending a ridge, not throwing a ball, and that the doctor had left his wife to continue walking their dog, rather than to retrieve it.

The Greineder children, Britt, Kirsten and Colin, sat glumly throughout the day. Britt broke into tears whenever her mother's dead body was mentioned, and also became flushed and flustered when her cell phone twice went off, disrupting court proceedings.

"I'm sorry. I keep shutting it off," she muttered through tears the second time that the phone rang.

The prosecution called eight other witnesses to the stand to help piece together the events surrounding the brutal murder and chaotic aftermath.

Wellesley police sergeant Peter Nahass testified that Greineder seemed more anxious than distraught after the murder, and that, while his clothes were bloodstained, his hands were suspiciously clean.

"He appeared to be fidgety, moving, he couldn't stand still," the officer recalled. "He had a yellow wind breaker jacket that was stained with what appeared to be blood. His hands were clean. There was no blood on his hands."

The prosecution claims that Greineder's pristine hands are an indication that he wore and then discarded gloves when killing his wife.

Nahass went on to testify about the recovery of two bloodstained gloves and the alleged murders weapons, a small hammer with a blue handle and pocket knife, in two nearby sewer grates.

Photographs taken of the evidence in the grates was displayed with a transparency projector to the jury.

Rick Magman, a Wellesley resident jogging through the park who encountered Greineder, also took the stand. He testified that, from a distance of about 30 feet, the doctor asked him whether he had a cell phone. Later, the jogger saw Greineder near his car at the park entrance frantically calling 911 and told the doctor that he would direct medical personnel down to his wife.

"He asked me to warn people not to go in the van because his dog was in there," Magman recalled

Grundy told the jury during his opening statement that evidence bearing the victim's blood was found in Greineder's vehicle.

The prosecution has theorized that Greineder planned the murder and planted several items he would use in the days preceding the crime. A baking pan, a set of surgical gloves, and a can of lighter fluid with a label advertising it as an effective stain reliever were all found buried under leaves near the crime scene.

A Wellesley woman named Patricia Andrews testified that she saw the doctor while walking her dog on the day before the murder.

Defense lawyer Martin Murphy in court

"I noticed the defendant and one dog walking into the park," she said.

But Andrews said she could not remember if the doctor was wearing a backpack or holding anything in his hands.

Hugh and Amber Halsey also took the stand and described an elaborate scavenger hunt they had set up for their kids and other children for Halloween. They both noted that none of the items found near the victim's body had anything to do with their activities.

Walter Adams, a Wellesley town employee who was at the park at 7:00 in the morning to check on a water pumping facility, said he did not see anyone in the park but did notice tire tracks from a vehicle that apparently came and left while he was working.

Court continued today even though a juror was absent due to a migraine headache. Judge Paul Chernoff made the highly unusual decision to allow the man to miss live testimony but watch tapes of the proceedings over the weekend.

Testimony resumes next Tuesday at 9:00 A.M.

The trial is being broadcast on Court TV.