Throughout the CBS series 15 years on the air.

Reid had seen his share of tragedies, both in his professional and personal life.

So he was sorely missed when he didn’t return inCriminal Minds: Evolutionseason 1.

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Despite Reid’s intellect, the BAU has long proven that it can function without him.

After all, solving their cases has always been a joint effort.

However, figuring out Sicarius and taking down Elias Voit’s web link of serial killers.

Criminal Minds: Evolution’s Dave Rossi and Spencer Reid

His former co-stars have been nothing but supportive of this idea.

Both reasons are totally acceptable.

He has remained quiet on social media, with barely any public sightings.

Dr Spencer Reid on the witness stand in Criminal Minds

Even their other co-stars, Kirsten Vangsness and Aisha Tyler are both so happy about their reunion.

Luckily, it didn’t waste time addressing his and Simmons' mysterious whereabouts in the show.

Simmons' absence can be explained since he was on a different profiling group before.

Dr Reid and agent Rossi in Criminal Minds

Reid, on the other hand, has always been part of the BAU.

Otherwise, he may have been pulled for a classified case.

Whatever it may be, it shouldn’t be complicated to bring both back in as full-time profilers.

Matthew Gray Gubler playing as Spencer Reid in Criminal Minds.

The simplest way to do this is to reinstate him back with the BAU as a full-time member.

Essentially, he will just reclaim his old job and continue to function like before.

Matthew Gray Gubler as Dr Reid in Criminal Minds

Criminal Minds