The answers are here!
Check out this great report from Gloin!
“Lurtz is played by New Zealand actor Lawrence Makaore, who played a Gang Leader in NZ film What Becomes of the Broken Hearted (sequel to Once Were Warriors).
Lurtz is the Leader of a band of Uruk-Hai at the battle of Amon Hen. He personally killed Boromir in one of the most dramatic scenes in The Fellowship of the Ring.
Lawrence Makaore is a VERY big man (I can’t remember exactly, maybe 6’4″) and has a very powerful voice which he used to command the Uruk-Hai.
I think Aragorn beheaded him later in the battle, I wasn’t around for that part.“
WOW! Talk about some great info.
UPDATE
Another ringer spy, Suomynona chimes with more information on this scene.
“He (Lurtz) shot about 4-5 arrows into Boromir, point blank.
Boromir stayed alive long enough to make peace and talk to Aragorn – he completely redeemed himself.“