Former Montreal Expos catcher Gary Carter holds up a Mets and Expos hat during the opening ceremonies at Major League Baseball's All-Star game at Yankee Stadium in New York on July 15, 2008. Carter, 57, was found to have an aggressive brain cancer in July 2011 and his condition has worsened with the discovery of new tumors on his brain. (Ray Stubblebine/Reuters)

Carter, 57, was first diagnosed with brain tumors last spring, but in recent weeks his condition worsened considerably, as first reported by the New York Daily News.

“(The doctor) told my mom that there are now several new spots/tumors on my dad’s brain,” Carter’s daughter, Kimmy Bloemers, wrote on the family’s blog Thursday. “I write these words with tears because I am so sad for my dad.”

Carter first complained of headaches and forgetfulness last May, leading to an initial MRI that revealed four small tumors on his brain. He underwent heavy chemotherapy and radiation treatments at Duke University, but the symptoms worsened this winter. After a Christmas Day fall left Carter with a torn rotator cuff, he underwent another MRI, which revealed several more cancerous growths.

Last week, Carter fell in his doctor’s office after receiving treatment for an open gum wound treated by an oral surgeon, according to a report from the New York Times.

Two weeks ago in a telephone conversation with the Daily News, Carter said, “I’m not feeling too good. It’s been coming on and coming on. I’ve had a chest cold. I’ve got sores in my mouth, blood clots. I get sick. ... There’s just so many things. ... It’s been nine months now and I don’t feel any different from Day One.”

In 19 major league seasons, ‘The Kid’ hit .262 with 324 home runs and 1,225 RBI. He spent his 11 seasons with the Montreal Expos, but earned notoriety in New York where he clubbed 24 home runs to lead the Mets to the 1986 National League East crown and a memorable seven-game World Series win over the Red Sox. Carter was elected to the Hall of Fame in 2003.

A family source told the Daily News that doctors are now discussing whether or not to continue treatment.

More MLB news from Washington Post Sports:

Nationals Journal: Nationals look like Prince Fielder favorites

Jason Reid: For Nats, Fielder, now’s the time

Early Lead: Ryan Braun to accept NL MVP, speak at banquet

Early Lead: Yu Darvish: Texas Rangers get their man from Japan