Question: this 2003 feature-length documentary film made by Nick Broomfield is about an American serial killer who shot her victims at what?

Context paragraphs:
Aileen Wuornos: The Selling of a Serial Killer: Aileen Wuornos: The Selling of a Serial Killer (1993) is a documentary film about Aileen Wuornos, made by Nick Broomfield.  It documents Broomfield's attempts to interview Wuornos, which involves a long process of mediation through her adopted mother Arlene Pralle and lawyer, Steve Glazer.

Biggie &amp; Tupac: Biggie & Tupac is a 2002 feature-length documentary film about murdered rappers Christopher "Notorious B.I.G." Wallace and Tupac "2Pac" Shakur by Nick Broomfield.

His Big White Self: His Big White Self is a 2006 documentary film made by Nick Broomfield.  It is a follow-up to his 1991 film "The Leader, His Driver and the Driver's Wife".  It was shown for the first time as part of More4's Nick Broomfield week which started on 27 February 2006.  The documentary follows Broomfield as he returns to South Africa 12 years after the collapse of the apartheid regime.  His previous film focused largely on JP Meyer, a driver for Eugène Terre'Blanche (the leader of the far-right Afrikaner Weerstandsbeweging), and JP's wife, Anita.

Heidi Fleiss: Hollywood Madam: Heidi Fleiss: Hollywood Madam (1996) is a feature-length documentary film by Nick Broomfield.  It is an examination of the woman herself, Broomfield attempting to uncover if she truly is a 'horrible person', and what made her that way.

Lynn-Maree Milburn: Lynn-Maree Milburn is an Australian writer, director, editor and producer.  Lynn-Maree directed the feature-length documentary "In Bob We Trust" and co-directed the feature-length documentary "Autoluminescent", the feature-length documentary Ecco Homo.  In 1993 she wrote, animated, produced and directed Memories and Dreams, a feature-length dramatised documentary that enjoyed Official Selection at Venice, Telluride, Yamagata, and Hungary’s Mediawave, winning multiple awards including Jury Prize at Hungary, Best Film at Melbourne International Film Festival and the AFI Open Craft Award.  She co-produced Amiel Courtin-Wilson’s documentary "Chasing Buddha," co-directed John Safran's Music Jamboree for SBSi (AFI Award Best Television Comedy 2003), directed several stories for John Safran’s Race Relations whilst continuing to direct television commercials.  She animated and directed numerous music videos including What You Need for INXS, and Desire (U2 song) for U2 winning several local and international awards.  She co-founded the production company, Ghost Pictures Pty Ltd with Andrew de Groot and Richard Lowenstein.

Tales of the Grim Sleeper: Tales of the Grim Sleeper is a 2014 feature-length documentary film by Nick Broomfield about the serial killer Lonnie David Franklin Jr., nicknamed the Grim Sleeper.

The Leader, His Driver and the Driver's Wife: The Leader, His Driver and the Driver's Wife is a 1991 British feature-length documentary film set during the final days of the apartheid regime in South Africa, particularly centring on Eugène Terre'Blanche, founder and leader of the far-right Afrikaner Weerstandsbeweging.  The film was directed by Nick Broomfield and released in 1991.  It received an average of 2.3 million viewers during its screening on Channel 4.  A year later it was the subject of legal action brought by the journalist, Jani Allan, in what has been described as "the libel case of the summer".  In 2006, Broomfield released a follow-up, "His Big White Self".

Aileen Wuornos: Aileen Carol Wuornos Pralle (February 29, 1956 – October 9, 2002) was an American serial killer who murdered seven men in Florida between 1989 and 1990 by shooting them at point-blank range.  Wuornos claimed that her victims had either raped or attempted to rape her while she was working as a sex worker, and that all of the homicides were committed in self-defense.  She was convicted and sentenced to death for six of the murders and was executed by lethal injection on October 9, 2002.

Daytona Beach killer: The Daytona Beach killer is an American serial killer responsible for the murders of four women in the Daytona Beach, Florida area from December 2005 to December 2007.  The killer has never been apprehended.  The involvement of a serial killer was feared after the discovery of the first three victims.

Aileen: Life and Death of a Serial Killer: Aileen: Life and Death of a Serial Killer is a 2003 feature-length documentary film about Aileen Wuornos, made by Nick Broomfield as a follow-up to his 1992 film "".  The film focuses on Wuornos' declining mental state and the questionable judgment to execute her despite her being of unsound mind.

Supporting paragraphs: Aileen: Life and Death of a Serial Killer Aileen Wuornos
Answer: point-blank range