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William Sierra
Known for: Acting
Born: August 11, 1957
William Matthew Sierra is an American former professional wrestling referee and manager better known by his ring name Bill Alfonso. He achieved his greatest success in Extreme Championship Wrestling in the mid-to-late 1990s. He is well known for the whistle that was almost always hanging around his neck, which he blew constantly during his wrestlers' matches In May 1995, he made his debut in Extreme Championship Wrestling as a "trouble-shooting referee".Introduced by Shane Douglas, he angered ma…
Known for

MLW War Games
2003

WWE: Undertaker 20-0 - The Streak
2012

The Ref Didn’t See It!
2025

Barbed Wire City: The Unauthorized Story of Extreme Championship Wrestling
2013
ECW Fan Cam: September 23, 1995
1995

Bret "Hit Man" Hart
1994

ECW As Good As It Gets
1997

ECW November to Remember 1995
1995

ECW Extreme Warfare Vol. 2
1996
ECW Fan Cam: January 27, 2000
2000
MECW Inaugural Show
2001
The Best of Shane Douglas
1998
ECW: The Best of Cactus Jack
2001
Battleground Championship Wrestling Presents ECW Reunion Show: A Tribute To The Extreme 2
2024

ECW Just Another Night 1996
1996

MLW Rise of The Renegades
2003
ECW Heat Wave 1997
1997

ECW Path of Destruction
2000
ECW Fan Cam: May 10, 1996
1996

ECW Hostile City Showdown 1996
1996

WWE: Blood Sport ECW - The Most Violent Matches
2006

ECW Hardcore Heaven 1997
1997

ECW Mountain Top Madness
1995
ECW Fan Cam: September 17, 1998
1998
ECW Fan Cam: February 6, 1999
1999

Hardcore Homecoming
2005

ECW: Extreme Evolution
2000

ECW Wrestlepalooza 1998
1998

ECW Holiday Hell 1996
1996

ECW Living Dangerously 1999
1999
Battleground Championship Wrestling
2021
ECW Fan Cam: October 15, 1999
1999
ECW Fan Cam: December 17, 1999
1999
ECW Fan Cam: July 28, 1996
1996
ECW Fan Cam: March 22, 1997
1997
ECW When Worlds Collide 1996
1996

ECW Ultimate Jeopardy 1996
1996

ECW Born To Be Wired
1997

ECW Anarchy Rulz 1999
1999

The WRLD on GCW
2022
ECW Fan Cam: January 30, 1999
1999

ECW: Bloodsport The Most Violent Matches
2006
ECW Fan Cam: November 23, 1996
1996

ECW Barbed Wire, Hoodies and Chokeslams
1995

ECW Crossing The Line 1999
1999

ECW Anarchy Rulz 2000
2000

ECW House Party 1999
1999

ECW Heat Wave 1998
1998

ECW Barely Legal 1997
1997

ECW November to Remember 1997
1997

ECW Heat Wave 1999
1999
ECW Fan Cam: August 25, 2000
2000

ECW Enter the Sandman 1995
1995

ECW It Ain't Seinfeld
1998

ECW House Party 1996
1996

ECW November To Remember 1998
1998

ECW Living Dangerously 1998
1998

MLW Hybrid Hell
2003

ECW Hardcore History
2001
ECW Fan Cam: October 18, 1996
1996
ECW Fan Cam: May 29, 1999
1999
ECW: January 27, 1996
1996

WWE Bloopers Bleeps and Bodyslams
1994

ECW The Doctor Is In 1996
1996

ECW Holiday Hell 1995
1995

ECW Hardcore Heaven 1996
1996
ECW High Incident
1996

ECW Wrestlepalooza 1997
1997

ECW House Party 1998
1998

ECW Hardcore Heaven 1999
1999

WWA The Revolution
2002
ECW Fan Cam: September 9, 2000
2000

ECW A Matter of Respect 1996
1996

ECW Guilty as Charged 1999
1999

ECW CyberSlam 1999
1999
ECW Fan Cam: May 16, 1997
1997
ECW Fan Cam: October 31, 1997
1997
ECW Fan Cam: October 23, 1999
1999
ECW Sunshine State Slaughter
1995

ECW November to Remember 1996
1996
ECW Fan Cam: May 2, 1997 (Barely Legal II)
1997

ECW Heat Wave 1995
1995
ECW Fan Cam: March 7, 1998
1998

ECW A Matter of Respect 1998
1998

ECW November to Remember 1999
1999

ECW Heat Wave 2000
2000

ECW CyberSlam 1996
1996
ECW Fan Cam: June 3, 2000
2000

ECW Hardcore Heaven 1995
1995

ECW Natural Born Killaz
1996

ECW Big Ass Extreme Bash 1996
1996
ECW Fan Cam: April 4, 1997
1997

GCW: Joey Janela's Spring Break X
2026

ECW Guilty as Charged 2000
2000
The Best of The Eliminators
1998

ECW Massacre on Queens BLVD
1996

ECW Gangstas Paradise 1995
1995
ECW Fan Cam: February 14, 1997
1997
WrestleCade Supershow 2019
2019
ECW Fan Cam: May 3, 1997
1997

ECW Big Apple Blizzard Blast
1996

ECW CyberSlam 1998
1998

ECW Living Dangerously 2000
2000

WWE Bashed in the USA
1993

Raw
1993

WWF Wrestling Challenge
1986

Mid-Atlantic Championship Wrestling
1981