"The Swedish cartoonist Lars Vilks, who was under police protection after his controversial drawing of the Prophet Muhammad in 2007 led to a series of death threats..."

"... has been killed in a car crash. Vilks died after the civilian police vehicle in which he was travelling near the town of Markaryd in southern Sweden collided with a lorry on Sunday.... Two police officers who were in the vehicle with the 75-year-old artist were also killed."

The London Times reports.

The cartoon that elicited the death threats — which seems unconnected to this car crash — depicted the head of Muhammad on the body of a dog.

From Vilks's Wikipedia page:

From 1997 to 2003, he was a professor in art theory at the Bergen National Academy of the Arts. As an art theorist, Vilks was a proponent of the institutional theory of art.... 

The link on those last 4 words goes to another Wikipedia page says: "The institutional theory of art... holds that an object can only become art in the context of the institution known as 'the artworld." 

Back to the main Vilks page:

In 1980 Vilks created two sculptures, Nimis and Arx, the former made entirely of drift wood and the latter of concrete and rock, in the Kullaberg nature reserve in Höganäs, Skåne. In 1996, the small area where the sculptures are located was proclaimed by Vilks as an independent country, "Ladonia". 

Nimis was sold to Joseph Beuys as a means to circumvent the Swedish building code laws concerning unlawful building process. The sculpture of Nimis was owned by the late conceptual artist Christo....

Vilks' long-standing controversies with different authorities due to his activities in the nature reserve Kullaberg, where Nimis, Arx, and Landonien are all located, received significant attention in Swedish media, which for the most part portrayed Vilks' work as specifically designed to be provocative. This attention has turned the area into something of a tourist attraction. 

In Vilks' activity as an art theorist, he commented on his own artistic activities in the second or third person..... He described himself as an "equal opportunity offender" in his critical depictions of religion. 

In 2007, Vilks caused an international controversy when he depicted Muhammad as a roundabout dog...

What is a roundabout dog? Wikipedia has a page for that:

In Sweden, especially around 2006, people put dog sculptures like that in roundabouts (a roundabout being what we tend to call a traffic circle or a rotary).

What is the meaning of a roundabout dog and what does it have to do with Muhammad? Is it chiefly meaninglessness — just something that's there... to delight or bother you, depending on who you are?