A "angry, violent" man was sentenced to life imprisonment for the murder of Julia James, a police community support officer. He was walking Julia's dog.
After "ambushing" Mrs James near her Kent home, Callum Wheeler killed Mrs James with a bar of metal.
Her 22-year-old son called Wheeler a "disgusting animal" that should never be seen the light of day.
When Wheeler was sentenced at Canterbury Crown Court by Judge Justice Wall, he was told he would serve at most 37 years.
Mrs James, a mother of two, was found dead with her Jack Russell dog Toby at Ackholt Wood, near her Snowdown home, on 27 April 2013.
According to court records, Mrs James was subject to "a very violent and sustained attack to the head".
On May 1, Wheeler confessed to the murder. A week later, he was found guilty.
He was found guilty by the jury in less than an hour and ten minutes.
Patrick Davis, Mrs James's son, said to the court that his mother's life was taken by a "sick,twisted individual's strange wishes".
He stated, "He should never see daylight again."
"My mum wanted to walk her dog, but was beaten by this horrible creature.
"I won't refer to him as an individual human being."
Paul James, Mrs James' husband, broke down repeatedly in tears while telling the court that his life was complete after he married his soulmate.
"My dreams and hopes were fulfilled."
He stated that he felt the same way when his wife was killed.
Wheeler was told by Mr Justice Wall that his actions had not only ended the life of one person prematurely, but also caused the death of the entire family.
By Jeremy Britton. BBC News, Canterbury Crown Court.
After being handcuffed by hospital staff, the defendant is now sitting on the dock with his head down.
Wheeler didn't respond when asked his name. His defence barrister had the task of confirming his identity to court clerk.
The judge was informed by the prosecutor that the defendant's metal bar was a jack for moving railway tracks.
She said Wheeler hadn't explained how it could play an innocent role in his daily life.
Prosecutor Alison Morgan QC stated that the defendant had "must' have touched" Julia James' breast DNA at Wheeler's sentencing hearing.
Ms Morgan stated, "Given that it was sexually explicit in the area of touching,"
Wheeler had been "highly sexualized" and searched the internet for the words "rape" several days prior to the attack, she claimed.
She added that his behavior after his arrest suggested he would attack other women in the woods again.
Ms Morgan stated that the aggravating aspect of the attack was the concern about women's safety.
"This was intentional targeting of a single female vulnerable due to her distance from other people."
Wheeler was told by Mr Justice Wall: "The attack that you launched against her was brutal, vicious.
He said, "I am drawn to the evident conclusion that this was not a spur-of-the moment aberration by You."
"Rather, it was an attack that was planned and planned in advance."
He said, "You were looking for a single female victim and were sexually motivated to do it."
Wheeler was seen in the countryside carrying the weapon just days before Mrs James' death. Hundreds of officers searched the area for the weapon over the following days.
Ms Morgan testified that the attack on Wheeler was not a "spontaneous and instantaneous act of violence" during Wheeler's trial.
She said it was planned over many days and weeks and that the defendant wanted to surprise his victim.
Ms Morgan testified before Wheeler's trial, that Julia James saw him on one occasion in Ackholt Wood just before his death.
Mrs James was "aware" of the presence "of a strange male" she had told her husband about the man as a "really odd dude".
Following police appeals, 1,400 people provided information and 6,700 hours footage from CCTV, doorbells, and dashcams.
Gavin Tucker, a gamekeeper, was one of the first to come forward. He provided police with a photo of him and dashcam footage from a man he saw acting suspiciously in the vicinity.
Wheeler was carrying a bag containing what turned out be the murder weapon, which was covered in plastic bags.
He was held at Broadmoor, a high-security psychiatric hospital in Berkshire.
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