Tonight's highlights include a couple of documentaries about September 11, the return of Back to Life, Good Girls and Unforgotten, plus the odd mix of Selena Gomez and Steve Martin in Only Murders in the Building . . .

Pick of the Day

9/11 One Day in America, 9.00pm, National Geographic

The 20th anniversary of the attack on New York’s World Trade Center is certainly going to be a reoccuring feature of various TV schedules over the coming ten days.

This series was made in official collaboration with the 9/11 Memorial & Museum, the six-parter offers a comprehensive account of the day using only archival footage - some never seen before - and new, original interviews with eyewitnesses who have now had almost two decades to reflect on the events they lived through.

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The result promises to be one of the most powerful, immersive and emotionally charged accounts ever produced about that fateful day.

First up, the personal accounts begin with firefighters racing to rescue civilians trapped above the first impact on the north tower.

Don’t Miss

9/11: Inside the President’s War Room, 8.30pm, BBC One

More on September 11, this feature-length documentary follows then US President George W Bush (below) and his staff as they dealt with the large-scale terrorist attack.

As you might recall, four commercial aircraft were used as missiles on the World Trade Center and the Pentagon.

The events of that day led to two decades of futile conflict in Afghanistan and Iraq.

As America and its allies now withdraw from Afghanistan and the Taliban resume control, this is the story of how it all began.

The film features testimony from George W Bush himself, as well as staff members Dick Cheney, Condoleezza Rice and Colin Powell.

The Secret Life of the Zoo, 8.00pm, Channel 4

Newcomer Safi, a rare bongo antelope from the mountains of Kenya, is giving enthusiastic breeding partner Moti the runaround.

Very soon the keepers realise why - it seems she may be about to give birth earlier than expected.

Sunda gharial crocodiles Frank and Frankie need to have their blood tested - but taking a sample from one of the world's largest and most dangerous reptiles is easier said than done.

Plus, George the giant rat needs to have surgery after an X-ray pinpoints a huge lump of hard faeces in his stomach.

New or Returning Shows

Back to Life, 11.05pm, BBC One

It’s taken a while, but here’s the second season of this dark dramedy starring Daisy Haggard as Miri Matteson, who’s back in the world after serving an 18-year prison sentence.

It’s now six weeks since her release, and Miri is optimistic about her future.

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She has got a trial shift at the supermarket, and she and neighbour Billy have been spending more time together.

But then her past returns to trouble her with the arrival of an unexpected visitor.

Unforgotten, 10.05pm, RTÉ One

Nicola Walker and Sanjeev Bhaskar return for the fourth season of this classy crime drama.

A dismembered body is found in a scrapyard and the team believes the remains had been stored in a domestic freezer for 30 years.

Meanwhile, after making the decision to retire from the police force, Cassie faces a dilemma when she learns she isn't entitled to her full pension payment unless she completes her 30 years of service.

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In Search of Sir Walter Scott, 9.00pm, BBC Four

Author Damian Barr marks the 250th of Walter Scott's birth by going in search of the legacy of one of Scotland's great historical figures, novelists and poets .

He reveals the long-lasting influence of Scott and his writing, his political campaigning and his role in creating a version of Scotland that still exists today.

New to Stream

Only Murders in the Building, Disney+

From the minds of Steve Martin, Dan Fogelman and John Hoffman, this whodunit follows three strangers (Martin, Martin Short and Selena Gomez) who share an obsession with true crime and suddenly find themselves wrapped up in one.

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When a grisly death occurs inside their exclusive Upper West Side apartment building, the trio suspects murder and employs their precise knowledge of true crime to investigate.

As they record a podcast of their own to document the case, the three unravel the complex secrets of the building which stretch back years.

Perhaps even more explosive are the lies they tell one another.

Soon, the endangered trio comes to realize a killer might be living amongst them as they race to decipher the mounting clues - before it’s too late.

Good Girls: Season 4, Netflix

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Christina Hendricks, Retta, Mae Whitman and Reno Wilson return for another run of the dramedy about three suburban mothers who turn to crime.

Under the watchful eye of the Feds, Beth, Ruby and Annie consider the perks and pitfalls of their work - all while Dean and Stan do the same.

Sparking Joy, Netflix

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Marie Kondo is back to help people transform their homes while transforming their lives in surprising and emotional ways.

Marie takes her life changing method a step further to help three deserving businesses organize their workplace along with an emotional tidy up of one employee’s life whether it’s in the home, work, personal life and/or relationships.

Viewers will also step into Marie’s home to meet her family and get a glimpse into how she tidies up her daily life.

Ending Tonight

Black Monday, 9.00pm, Sky Comedy

Streaming on NOW TV

As season three wraps with a double-episode, Mo tries to make his own bachelor party special.

But a killer is still on the loose and they’ve chosen to celebrate in a cabin . . . in the woods.

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Keith enjoys his social status upgrade until someone unexpected returns.

Then in the season finale, it’s Mo’s wedding day, but priority number one is to make sure he and his crew live to see another decade.

He and Dawn, Blair, Keith and Yassir work together to do whatever it takes to make sure that happens.

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