Ivanka Trump's stalker, Justin Massler, 34, was only a block away from her family's home, Trump Tower, when the Secret Service swooped in and apprehended him

A mentally ill man who used to terrorize Ivanka Trump with a barrage of creepy emails, tweets and online videos, and threatened to commit suicide in her Manhattan jewelry store, has been arrested in a hotel room one block from Trump Tower.

In 2012, Justin Massler pleaded guilty to aggravated harassment and criminal contempt charges.

After serving six months in prison he was given five years of probation, during which time he was supposed to continue receiving psychiatric treatment and medication.

But Massler, now 34, is in Bellevue Hospital after the Secret Service nabbed him after he booked a hotel room just one block from Trump Tower.

Massler, from Reno, Nevada, has long been fixated with Ms Trump, the daughter of tycoon and President-elect Donald Trump and his ex-wife Ivana, saying in his dream life he wanted to marry her.

Massler was jailed for six months for aggravated harassment of Donald Trump's daughter in 2012 and was then given five years probation which he is still supposed to be serving (pictured in 2011)

Massler stalked Ivanka for years with frightening YouTube videos, emails, Twitter messages and visits to her NYC jewelry store

He had been receiving treatment in a Nevada mental health facility but fled in November. He was found in late November in Midtown Manhattan.

In 2012, he was jailed after his remarks became ominous after he threatened to commit suicide in the model and businesswoman's store.

Massler sent Ivanka distressing emails and messages on Twitter and even posted a picture of himself covered in blood.

During his two-year obsession, Massler also said he wanted to 'talk some sense into' her husband, Jared Kushner and 'commandeer' the New York Observer which Mr Kushner publishes.

Pictured here, during a court appearance in 2011, Massler exclaimed 'Aliens have really ruined my life!'

Even after his arrest and a court order to stay away from Ivanka Trump, star of Celebrity Apprentice, and her family, Massler continued to try to contact them.

Massler, who had his name legally changed to Cloud Starchaser and told authorities his address was 'a volcano in Hawaii', is schizophrenic and has a history of psychiatric hospitalizations, said his lawyer George Vomvolakis.

Massler also had to sign an order of protection barring him from any contact Ivanka Trump and her husband, along with father Donald and her siblings.