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Brandon Judd  president of the labor union  said  Agent Rogelio Martinez  died Sunday of blunt force trauma to the head.
Federal authorities have not yet said how  Martinez  was killed.
Authorities have been searching for witnesses and potential suspects after  Martinez  was killed and a fellow agent was seriously injured. Officials with U.S. Customs and Border Protection and the Border Patrol said in a statement that the pair were âresponding to activityâ near Interstate 10 in Van Horn  Tex.  when they were harmed. The other agent called for help  and other agents provided medical care and took them to a hospital.
Following news that an agent had been killed  President Trump appeared to connect  Martinez âs death to border security and plugged his plans for a border wall on Twitter on Sunday night.
Sen. Ted Cruz (R-Tex.) said on Twitter  without any further explanation  that  Martinez  and the other agent were âattackedâ and he also linked the incident to security on the border with Mexico.
Agent Rogelio Martinez  your service and sacrifice will never be forgotten. Our hearts go out to your family. pic.twitter.com/WVuW8C2N8n â USBPChief (@USBPChief) November 20  2017
Isaac Morales  who was stabbed in a bar parking lot in El Paso  was the only agent besides  Martinez  to die in 2017. Three agents died in 2016; two of them in car accidents  one of a heart attack while on bike patrol.
Slain border agent may have been beaten to death by rocks in âgrisly scene â union leader says

CLOSE White House Spokesman  Sean Spicer  doubled down on  his  claim that President Trump's inauguration was the most watched in history.  He  also said  his  intention is to "always tell the truth " but said there may be disagreement over the facts. (Jan. 23) AP
White House counselor Kellyanne Conway claimed that âalternative factsâ were employed by  Press Secretary Sean Spicer  when he tried to make the case that âthis was the largest audience to ever witness an inauguration  period  both in person and around the globe.â Actually   Spicer  got several facts wrong.
 Spicer  then read a prepared statement later that day  further criticizing the media for âdishonesty.â
 Spicer   Jan. 21: "Secondly  photographs of the inaugural proceedings were intentionally framed in a way  in one particular tweet  to minimize the enormous support that had gathered on the National Mall. â¦ We know that from the platform where the president was sworn in  to 4th Street  it holds about 250 000 people. From 4th Street to the media tent is about another 220 000. And from the media tent to the Washington Monument  another 250 000 people. All of this space was full when the president took the oath of office. We know that 420 000 people used the D.C. Metro public transit yesterday  which actually compares to 317 000 that used it for President Obamaâs last inaugural. This was the largest audience to ever witness an inauguration â period â both in person and around the globe."
At a Jan. 23 press conference   Spicer  made an alternative argument  saying the number of people watching the inauguration on TV  online and in person had to be the largest ever.
âI have a right to say if you add up the network streaming numbers  Facebook  YouTube  all of the various live streaming that we have information on so far  I donât think thereâs any question it was the largest watched inauguration  ever â  Spicer  said.
On that point   Spicer  may be correct. While Nielsen TV ratings were higher in past years  some data suggests online viewership was up compared with 2009. But there is no comprehensive measurement available that would prove or disprove this claim.
On NBCâs Meet the Press  host Chuck Todd asked White House counselor Kellyanne Conway  â[W]hy the president asked the White House press secretary to come out in front of the podium for the first time and utter a falsehood?â Conway responded: âDonât be so overly dramatic about it  Chuck. What â Youâre saying itâs a falsehood. And theyâre giving Sean Spicer  our press secretary  gave alternative facts to that.â
PBSâ âNewsHourâ also posted a timelapse video of the crowd throughout Inauguration Day  which shows it didnât quite stretch back to the Washington Monument  as Trump and  Spicer  said. And as our fact-checking colleagues at The Washington Postpointed out  other journalists had more photographic evidence on Twitter.
Metro ridership. At the press conference   Spicer  also gave inaccurate numbers for those taking the Washington  D.C.  Metro system for Trumpâs inauguration compared with Obamaâs.
But thatâs not what Metro said  and  Spicer  acknowledged that during  his  Jan. 23 press conference.
 Spicer âs 317 000 figure was the number Metro gave for riders as of 11 a.m. on Inauguration Day 2013. The comparable number  for 11 a.m.  for Trumpâs inauguration was 193 000.
Crowd-size experts.  Spicer  was right about one thing: It appears  as  he  said  that no one has scientifically calculated estimates of the crowd size for Trumpâs inauguration. Congress has prohibited the National Park Service from making official estimates after it produced an official estimate that 460 000 turned out for the so-called âMillion Man Marchâ in 1995  prompting organizers to threaten a lawsuit.
 Spicer  argued that floor coverings over the grass on the National Mall âhighlight[ed] where people were not standing  while in years past the grass eliminated this visual.â
âI donât know how  [Spicer]  kept a straight face when he said that â Doig said.
TV and online viewership. But at the Jan. 23 press conference   Spicer  emphasized the combined audience â in person  watching on TV and watching online â was the highest in history. Asked if he was now saying that it was the largest in-person crowd for an inauguration   Spicer  said  âI am not. I am saying that it was the total largest audience witnessed in person and around the globe.â
Fact check: The controversy over Trump's inauguration crowd size

Soccer Football - Premier League - Tottenham Hotspur vs Liverpool - Wembley Stadium  London  Britain - October 22  2017  Tottenham's Harry Kane  celebrates scoring their first goal with Serge Aurier REUTERS/Eddie Keogh
Tottenham Hotspur brutally exposed Liverpool’s defensive frailties as  Harry Kane  plundered two more goals in  his  side’s 4-1 romp at Wembley on Sunday.
In front of 80 827 fans  the biggest ever Premier League attendance   Kane  took  his  league tally to eight for the season with the first and fourth goals in a clinical Spurs display.
Soccer Football - Premier League - Tottenham Hotspur vs Liverpool - Wembley Stadium  London  Britain - October 22  2017 Tottenham's Son Heung-min celebrates scoring their second goal with  Harry Kane
In the fourth minute  Spurs defender Kieran Trippier played  Kane  into acres of space and the England striker cleverly dinked the ball around goalkeeper Simon Mignolet with his right foot before guiding a shot home with his left.
In the 56th minute  Mignolet flapped at Trippier’s inswinging free kick  Jan Vertonghen’s shot was cleared off the line by Roberto Firmino but it fell to the lurking  Kane  who steadied  himself  before drilling into the corner.

Kane scores twice as Tottenham crush Liverpool