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On 31 January 2013, Doni joined Brazilian side Botafogo-SP (the club he started his career with) from Liverpool after not featuring in the team's starting XI since the final day of the 2011–12 season. On 12 August 2013, he retired from playing football due to heart problems.

He retired from international football on 1 February 2013 due to his previous cardiac problems.

Doni made his Premier League debut for Liverpool on 7 April 2012 in a 1–1 draw against Aston Villa at Anfield. In his next match, on 10 April, he received a red card and conceded a penalty against Blackburn Rovers. He subsequently received a suspension, missing the FA cup semi-final at Wembley v Everton as a consequence. Doni would play his second full competitive 90 minutes in a 1–0 defeat to Fulham at Anfield. Doni made his fourth league appearance on the final day of the season, a 1–0 defeat to Swansea City. In his first season at Anfield, Doni made a total of four appearances.

In the summer of 2012, new manager Brendan Rodgers allowed Doni to return to Brazil temporarily on personal leave. Although he was still included in Liverpool's squad for the 2012–13 season, Due to this personal leave he missed a chance to start while first choice goalkeeper Pepe Reina was injured; Brad Jones played instead.

It was finally announced, upon leaving Liverpool, that Doni had suffered a heart attack during a routine medical in the summer of 2012. Doni explained that he was unconscious for 25 seconds and almost died. He was advised by professionals to never play football again.

After Vincenzo Montella replaced Ranieri as head coach in February 2011, Doni returned to starting XI in the second match in-charged by Montella, a 2–2 draw with Parma on 27 February.

Doni signed for Premier League club Liverpool on 15 July 2011 on free transfer. He was expected to serve as second-choice goalkeeper behind Pepe Reina. As part of the deal, Roma paid Doni €1.5 million net of tax, roughly covering the wage difference between Roma and Liverpool's deal. Due to Reina's red card against Newcastle United in April 2012, Doni won a place in the starting lineup, becoming the first goalkeeper other than Reina to play in a Premier League match for Liverpool since Daniele Padelli on 13 May 2007.

On 11 May 2010, it was announced that Doni would be part of the Brazilian squad which would compete at the 2010 FIFA World Cup in South Africa.

In the 2009–10 season, the club continued to use Artur and then Júlio Sérgio as first-choice goalkeeper, despite employed Claudio Ranieri to replace Luciano Spalletti. Doni was recovering from injury. In October 2009, he returned to the team for the match against Milan on 18 October, but soon lost his place again to Júlio Sérgio.

In May 2008, his contract was extended to June 2012. He would have earned a gross annual salary of about €4 million in average (from €3.8M in the first year to €4.3M in the last year)

In the second half of the 2008–09 season, he lost his place to Artur after a 1–4 loss to Juventus on 21 March. He continued for the next two matches to be named to the matchday squad but was not starting nor available for selection on the substitutes' bench. He then trained separately with injured players and visited the doctor for his knee in April 2009.

He was included in the preliminary squad for the 2008 Summer Olympics, but eventually did not get a place in the final list by coach Dunga.

On 11 April 2007, Doni conceded seven goals in a UEFA Champions League tie against Manchester United, with the game ending 7–1. The following season the two teams met again, but Doni was injured.

Doni earned his first cap with the Brazil national team against Turkey in Dortmund on 5 June 2007.

At the 2007 Copa América, he was selected as Brazil's first-choice goalkeeper moments before their first match against Mexico, replacing Helton. His play in the tournament included two penalty saves in penalty kicks against Uruguay in the semi-finals, which sent Brazil to the final. Brazil won the tournament with a 3–0 win over Argentina.

His contract was renewed on 13 April 2006, now worth €1.25 million a season (in gross). In his second season with Roma, he became one of the best goalkeepers of the Serie A. He won the Coppa Italia twice in 2007 and 2008, and also finished as the runner-up of Serie A in 2007 and 2008.

Doni joined Italian Serie A club Roma on 30 August 2005 from Juventude, after Roma paid his buy-out clause of approximately US$18,000. He signed a 1+3 year contract worth €300,000 in gross in the first year.

Doniéber Alexander Marangon (born 22 October 1979), known as Doni, is a Brazilian former footballer who played as a goalkeeper.