Spoiler alert: Dont read unless you have watched the season 1 finale ofMayans M.C.on FX.

Sons of Anarchyfans were treated to another reunion in tonights season ender forMayans M.C.

an appearance by David Labrava, who played MC member Happy on the original drama.

MAYANS M.C. – Pictured: JD Pardo as EZ Reyes. CR: James Minchin/FX

James Minchin/FX

But Happy is definitely not bringing the comic relief.

The episode ends with EZ (JD Pardo) realizing that it was Happy who killed his mom.

Here, creatorKurt Suttertalks about the decision to bring back Labrava, and what to expect fromseason 2.

ENTERTAINMENT WEEKLY:Election night.

And then I was like, You know what?

That makes a lot of sense.

At first I thought maybe its a cop.

Then I just realized, oh, it was Happy who killed EZs mom.

Eight years ago, Happy was a Nomad.

We know he is a hitman.

So it made sense that we could see some ancillary characters from Charming coming.

I dont know how we will pay it off, I have no idea where its going to go.

How did David react when you called him?Dave has had a rough year.

He lost his stepson.

WhenS.O.A.ended and I was neck-deep in medieval blood, I had distanced myself fromSonsfor a while.

Charlie Hunnam [S.O.A.s Jax Teller] was the only one I stayed in touch with.

Everyone else I needed distance from.

I think that really was difficult for David.

We were so close before everything ended.

I really lost touch with him.

Then he was down in L.A. and I sat him down and told him what I wanted to do.

He just started sobbing.

Hes fierce as f, but like all of us, hes also soft and gooey.

It will become another external fire burning underneath him.

I dont want to mislead fans by saying next season is going to be season 8 ofSons of Anarchy.

Im tired of chasing what I think I want.

We will see the tension of that play out.

What will happen when EZ tells Angel about Happy?

Because the truth is, the Mayans relationship with the Sons is profitable.

For them to act on Happy could completely undermine things with Galindo.

What does that look like?

That dynamic is what I learned onThe Shieldfrom Shawn Ryan.

Throw in all this crazy emotional family and relationship s while theres a guy killing children on the street.

They still had to do their job.

What does it look like to do that job while being colored by all these emotional things?

Thats what I love to do.