First victim of what? Biri's death is not part of the al-Aqsa Intifada because the intifada started after his death - after Ariel Sharon's visit to the al-Aqsa site. You see, that's how it got the name "al-Aqsa". The Israeli government propaganda repeated at the websites you list claims that the Palestinians started the al-Aqsa intifada before Sharon even visited the al-Aqsa site. Even the "Palestine Facts" source you cite and the objective Mitchell report point to Sharon's visit as the trigger for the al-Aqsa intifada. Of course there is constant violence in the area so anyone can name his own start date. We can go back to 1948 or 1917 if you want. It does no service to Wikipedia to throw Israeli government propaganda into the article. ( I am sure that won't stop you though).    
"Also on September 28, 2000, Ariel Sharon visited the Temple Mount in Jerusalem. This visit became the pretext for instigating large scale demonstrations, the start of the al-Aqsa infifada."  

"On September 28, 2000, Ariel Sharon marched defiantly and provocatively through the Al Aqsa Mosque in Jerusalem, touching off the current round of violence. "   

The Mitchell Report:
"Mr. Sharon made the visit on September 28 accompanied by over 1,000 Israeli police officers. Although Israelis viewed the visit in an internal political context, Palestinians saw it as highly provocative to them. On the following day, in the same place, a large number of unarmed Palestinian demonstrators and a large Israeli police contingent confronted each other. According to the U.S. Department of State, "Palestinians held large demonstrations and threw stones at police in the vicinity of the Western Wall. Police used rubber-coated metal bullets and live ammunition to disperse the demonstrators, killing 4 persons and injuring about 200."[4] According to the GOI, 14 Israeli policemen were injured.[5] Similar demonstrations took place over the following several days.[6] Thus began what has become known as the "Al-Aqsa Intifada" (Al-Aqsa being a mosque at the Haram al-Sharif/Temple Mount). "  

Furthermore, in the article Terrorism_against_Israel_in_2000#August, it says Biri died in August after being attacked by "terrorists". (If Biri was an Israeli soldier in occupied Gaza, why are his attackers called "terrorists" in Wikipedia?). You need to sort out your Israeli propaganda to at least get the dates and descriptors right. 
"* August 27: Terrorists attack a group of vehicles traveling to Netzarim with two roadside bombs and automatic gunfire.  David Biri, age 19, is wounded.
 August 28: David Biri dies of wounds suffered in a Palestinian terrorist attack the previous day.
 September 29: Border policeman Chief Inspector Yossi Tabaji, 27, of Ramle, killed and a second Israeli border policeman wounded by a Palestinian Authority policeman on a joint patrol near Kalkiliya District Coordinating Office. "
Yossi Tabaji and several unnamed Palestinian youth were also killed in the days before the "official start" of the al-Aqsa intifada because there are constant killings almost every day in the conflict. The al-Aqsa intifada is an upsurge in the violence that started after Sharon's visit to the al-Aqsa site. That is the commonly understood definition of al-Aqsa intifada. Adding stories about Israeli deaths that happened the day before is just Israeli government propaganda to deflect blame away from Ariel Sharon.  19:00, 20 Dec 2004 (UTC)