Tarot Cards As Criminal Twilight Language

The Joker? The Hierophant? Jack the Ripper? The Hanging Man? Twilight Language abounds.

As a followup to the recent Austin shootings (see "Gunman McQuilliams Targets 3 Major Austin Governmental Sites"), the identification of the shooter as Larry Steven McQuillams revealed his use of the Twilight Language.

Before his attack, McQuilliams changed his last public individual Facebook profile photo to the following:

It is the Hierophant Tarot card (h/t SMiles). Following is the complete view.

The Hierophant (V), in some decks named The Pope, is the fifth trump or Major Arcana card in most traditional Tarot decks.
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In many modern packs, the Hierophant is represented with his right hand raised in what is known esoterically as the blessing or benediction, with two fingers pointing skyward and two pointing down, thus forming a bridge between Heaven and Earth reminiscent of that formed by the body of The Hanged Man. The Hierophant is thus a true “pontiff”, in that he is the builder of the bridge between deity and humanity.
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In most iconographic depictions, the Hierophant is seen seated on a throne between two pillars symbolizing Law and Liberty or obedience and disobedience, according to different interpretations. He wears a triple crown, and the keys to Heaven are at his feet. Sometimes he is shown with worshippers, as his alternate title is the Pope or, sometimes, Jupiter.
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Some interpretations also suggest a link between the card and the myth of Isis and Osiris, a claim made about many cards. Source. 

There is a long tradition of leaving "calling cards" of various types at crime scenes. 

One of the most significant examples in history is those left by Jack the Ripper, which were wrongly interpreted as being Jewish in origin, when, in fact, they were Masonic.

Jack the Ripper is believed to have left two calling cards by Goulston Street, London on September 30, 1888, the night he murdered Elizabeth Stride and Catherine Eddowes: a scrap of Eddowes' apron and some graffiti reading Juwes are the men That Will not be Blamed for nothing. Source.

First off, the actual location of the killings, near or in Mitre Square is important, Freemasonically.

Also, in one widely disseminated theory:

Author Stephen Knight suggested that "Juwes" referred not to "Jews," but to Jubela, Jubelo and Jubelum, the three killers of Hiram Abiff, a semi-legendary figure in Freemasonry, and furthermore, that the message was written by the killer (or killers) as part of a Masonic plot. There is no evidence that anyone prior to Knight had ever referred to those three figures by the term "Juwes". Knight's suggestion was used in fictional treatments of the murders, such as the film Murder by Decree, and the graphic novel From Hell by Alan Moore and Eddie Campbell. Source.

In terms of the Beltway Sniper mystery, Tarot cards were used to leave messages.

John Muhammad and Lee Malvo, the so-called "Beltway Snipers," engaged in 23 days of random attacks in the Washington, D.C, area, in October 2002. Muhammad used a Bushmaster .223 rifle.

The snipers left Tarot “Death” cards like this one

at some of the shooting sites. Note the words

“Call me God” at the top. Photo: Official FBI page.

On October 7, 2002, at 8:09 a.m., Iran Brown, a 13-year-old boy, was shot in the abdomen and critically wounded as he arrived at the Benjamin Tasker Middle School at 4901 Collington Road in Bowie, Maryland, in Prince George's County (Brown's name was concealed from the public but was later revealed). His aunt, a nurse who had just brought him to school, rushed him to a hospital emergency room. Despite serious injuries, including damage to several major organs, Brown survived the attack and ultimately testified at Muhammad's trial. At this crime scene the authorities discovered a shell casing as well as a Tarot card (the Death card) inscribed with the phrase, "Call me God" on the front and, on three separate lines on the back, "For you Mr. Police." "Code: 'Call me God'. Do not release to the press."
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Allegedly, at several scenes Tarot cards were left as calling cards, including one Death card upon which was written "Call me God" on the front and on the back on three separate lines the words, "For you mr. Police." "Code: 'Call me God'." "Do not release to the press." This information was leaked to the press and misquoted often as "I am God" or some similar misquote of the actual words on the tarot card. Source.

Heath Ledger's Joker and his card.

The Hanging Man Tarot card.

The Imaginarium of Doctor Parnassus: Heath Ledger's final role.